Practical work
1. What is the mass of a solution of sulfuric acid with a mass fraction of it in the solution of 96%
spent on dissolving copper scrap weighing 12.8 g, which contained 0.5 parts by mass of copper?
2. What volume of ammonia can be obtained by treating ammonium chloride weighing 12 g with a solution
sodium hydroxide, which contains 8 g of it.
3. What is the practical yield of gas, if 4 liters of it were obtained by the thermal decomposition of potassium nitrate
weighing 40.4 g?
4. What is the practical yield of the sediment, if 6.5 g of it was filtered after
addition of 15 g of barium hydroxide solution with a mass fraction of 40% to orthophosphate acid
weighing 5 g.
5. How will the rate of the reaction that takes place in the gas phase change when it decreases
temperature by 30°C, if the temperature rate coefficient for this reaction is equal to 3.
6. The reaction of the decomposition of phosphorus pentachloride proceeds according to the equation:
PCl 5 (g) ↔ PCl 3 (g) + Сl 2 (g) – 92 kJ. How to change: a) temperature; b) pressure; in)
the concentration of reactants to shift the equilibrium of the reaction towards the decomposition of PCl 5 (to the right).

The number of grams of oxygen that can be prepared from 8.50g of pottasium chlorate is 3.33grams.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, the decomposition of KClO₃ is generally used to prepare small amounts of O₂ in the laboratory.

2KClO₃ → 2KCl + 3O₂

Based on the above equation, 3 moles of oxygen is produced by the decomposition of 2 moles of pottasium chlorate.

8.50grams of KClO₃ is calculated in moles as follows: 8.50g ÷ 122.55 g/mol = 0.069mol of KClO₃.

This means that 0.069 × 1.5 = 0.104 moles of oxygen is produced.

mass of oxygen produced = 0.104 × 32 = 3.33grams.

Therefore, 3.33grams is the mass of oxygen formed.

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The Lewis structures of the compounds have been shown. In each case, the least number of formal charge lies on nitrogen hence it is the central atom.

The term Lewis structures help us to be able to see what a molecule looks like. We know that the Lewis structures show the symbol of the element and then the number of electrons that are in the atoms of the element as dots.

In this case we have shown the Lewis structures of the compounds that are shown. The formal charges of the compounds are also shown in the image that is described here.

Looking at the Lewis structure as it has been shown, we can see that nitrogen always has the least charge density hence we can see that nitrogen would always be the central atom in the compounds as shown.

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The pressure that must be applied to increase the dentisy by 0.10% is 453.48 atm.

It's important to note that isothermal compressibility simply means the fractional differential change that can be seen in the volume as a result if the change in pressure.

It should be noted that the isothermal compressibility formula will be:

= 1/v (dv/dp)

where v = volume

p = pressure

dv = 0.10% = 0.001

This will be:

2.21 × 10^(-6) = 0.001/dp

dp = 0.001 / 2.21 × 10^(-6)

dp = 452.48 atm

New pressure = 1 atm + 452.48 atm

= 453.48 atm

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Complete question

The isothermal compressibility of lead at 293 K. Calculate the pressure that must be applied to increase the dentisy by 0.10%.

Answer:

A

B that is Cr,MN,Fe,Co. is the correct answer

C

D

Answer:

See explanation

Explanation:

3. so the three metals are Cu, Zn, and Fe (i'm assuming based off of the other answers)

A metal (M1) more reactive than the one in solution (M2) will swap places, precipitating M2 out and M1 will dissolve in solution.
So as an example, Zinc is more reactive than Copper, so Zinc metal will displace Copper 2+ in solution, giving Copper metal and Zinc 2+ in solution

The metal ion in solution is Zn2+, which is a pretty reactive metal. We know that a metal has to be more reactive than Zn to turn Zn2+ into Zn. This means that any metal which produces a change when allowed into contact with Zn2+ would have to be very reactive.

The three metal wires are: Cu, Zn, and Fe

Cu is not more reactive than Zn, so no reaction will occur between Cu and Zn2+.

Fe is not more reactive than Zn, so no reaction between Fe and Zn2+

Zn is well... as reactive as Zn, so there will also be no reaction (because there is no incentive for change, no change happens)

Thus, number 3 will have an answer of "No reactions were observed, and no spontaneous chemical equations can be written" (Though zinc does react with water very slowly. Also, if the ZnCl2 was contaminated with acid, the Zinc wire may have formed some bubbles )

For number 4, it is the same logic. But it is also a little more complicated.
The metal in solution is Fe3+. The wires are Zn, Fe, and Cu
The annoying (or cool, depending on how you look at it) thing about Fe3+ is that it can be reduced to either Fe2+(aqueous), or all the way to Fe(solid).
depending on how much reactant is added and what exactly that other reactant is.

From this point on, instead of saying "Because Zn is more reactive than Fe..." I'll say "Because Zn turning into Zn2+ is more favourable than Fe turning into Fe3+" or something of the sort. Hopefully It doesn't become too confusing. Please ask questions in the comments

Zn turning into Zn2+ is much more favorable than Fe turning into Fe3+, so the Zn will react with Fe3+, turning it into Fe and giving Zn2+ (Charges are not balanced)

So Zn(s) + Fe{3+}(aq) -> Zn{2+}(aq) + Fe(s)

and balance it to get

3Zn(s) + 2Fe{3+}(aq) -> 3Zn{2+}(aq) + 2Fe(s)

Fe may seem like it would not react with Fe3+ since they both are iron. However Fe2+ exists, and since Fe2+ turning into Fe3+ is unfavourable (meaning that Fe3+ is a stronger oxidant) and Fe turning into Fe2+ is favourable, the following reaction happens:

Fe(s) + 2 Fe{3+}(aq) -> 3Fe{2+}(aq)

In this reaction, each iron metal atom gives two iron 3+ ions one electron, loosing 2 electrons itself in the process and turning into Fe2+. The two iron 3+ ions given one electron also turn into Fe2+ ions, resulting in 3 Fe2+ ions total

Copper is fairly unreactive, and while FeCl3 is technically reactive enough to react with copper, forming FeCl2 and CuCl, the CuCl layer prevents underneath copper from reacting further.

Answer:

Your break would end at 4:18

Explanation:

Answer:

4.4 x 10⁻¹⁹ J

Explanation:

To find the energy of the photon, you need to use the following equation:

E = hf

In this equation,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J·s)

-----> f = frequency (Hz)

You can plug the given value and constant into the equation and solve for "E". The final answer should have 2 sig figs like the given value (6.7 x 10¹⁴ = 2 sig figs).

E = hf                                                               <----- Given equation

E = (6.626 x 10⁻³⁴ J·s)(6.7 x 10¹⁴ Hz)              <----- Insert values

E = 4.4 x 10⁻¹⁹ J                                              <----- Multiply

The volume of the lead II iodide required is 649 mL.

We know that the volume can be obtained by the use of the stoichiometry of the reaction. In this case, we have been given the balanced reaction equation as it appears in the question above. We now have to use it and find the volume as the question must have required.

Thus;

Number of moles of the lead II nitrate = 0.660 M * 319/1000 L

= 0.211 moles

Now we have to recall again that the number of moles is obtained as the product of the concentration and the volume of the solution.

Using the stoichiometry of the reaction;

1 mole of the  lead II nitrate reacts with 2 moles of the ammonium iodide

0.211 moles  of the  lead II nitrate reacts with 0.211 moles  * 2 moles/ 1 mole

= 0.422 moles

Now;

Volume of the solution = number of moles/ concentration

= 0.422 moles/0.650 M

= 0.649 L or 649 mL

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another name for a maggot is a worm

The answer to the task from above about the an atom of element periodic table is given below:

The chlorine atom is one of the halogens in the periodic table.

Right from time immemorial, the indepth knowledge and understanding of how atoms are arranged in the periodic table and react with with each speaks volume of the identities of the properties of elements.

Chlorine is regarded as an halogen simply because they are salt formers when it atoms react with alkali metals.

So therefore, it can be deduced that the periodic table is the heart of chemistry.

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Mole measures the number of elementary entities of a given substance that are present in a given sample. The mass of hydrogen is 20.2gram.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance.

Given number of atoms= 6.02 x 10²⁴atoms

we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number

mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

Substituting the values

mole=6.02 x 10²⁴÷ 6.022×10²³

mole = 10 mole

Mole = mass ÷Molar mass

Molar mass = 2.02 g/mol

Substituting the given values

10= mass ÷ 2.02 g/mol

Mass = 20.2gram

Therefore, mass of hydrogen is 20.2gram.

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Since the A digital signal transmits energy in the form of waves, the conclusion that would be best based on this information is option C:  Digital transmission of information is a fast and reliable method.

Signals, both digital and analog, are transferred via electromagnetic waves. The sound you hear or the graphics you see on a screen are the result of changes in frequency and amplitude. The continuous waves that make up analog signals can be of any frequency and amplitude.

Note that Data transfer, also known as digital transfer or digital communication, is the movement of data between two locations. Digital messages from a data source, such as a computer or keyboard, may be the source of the transmitted data. A phone call or a video signal are examples of analog signals that could also be present.

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The volume of the flask for the preparation of 0.231M solution can be 200ml flask. The equation C1V1 = C2V2 is used for the dilution of the samples.

What is dilution?

Dilution is a process in which a solution is made less concentrated by adding some other constituent to it. To dilute a solution more solvent should be added than the solute. The number of ions of solute remains the same but the volume is increased so the concentration decreases.

For the dilution using,

C1V1 = C2V2

5.2M x 8ml = 0.231M x V2

V2 = 5.2M x 8ml / 0.231M

V2 = 180.08ml.

Therefore, 180.08ml of new solution is made through dilution for which me need 200ml flask or higher volume flasks.

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The final concentration of the diluted solution of NaF is equal to 1.24 M.

The concentration and the volume of the stock solution or dilute solution can be determined from the following equation:

M₁V₁ = M₂ V₂

where M₁ and V₁ are the concentration and volume of the stock or concentrated solution respectively and M₂ and V₂ are the concentration and volume of the diluted solution.

Given, a stock solution of NaF of concentration, M₁ = 2.4 M

The concentration of the diluted solution of NaF is M₂.

The volume of the concentrated solution of NaF, V₁ = 1.7 L

The volume of diluted solution of NaF, V₂  = 3.3 L

Substitute the value of the concentration and volume of NaF in equation (1):

(2.4)× (1.7) =  M₂ × (3.3)

M₂ = 1.24 M

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The image shows the Bohr model of the chlorine atom.

We know that the Bohr model has to do with the model in which the electrons that are in the atoms are arranged in a definite order. The implication of this is that the electrons would be arranged in a certain specific energy level such that an electron can be moved from a lower to a higher energy level as we can see from the image that has been shown in the question that has been asked.

Having said that we have seventeen protons in the atom and the implication is that there are also seventeen electrons in the atom and this is going to correspond to the element chlorine atom which can be shown to be a member of the group seventeen of the periodic table of the elements.

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The solubility constant (Ksp) of lead (II) chloride if it has a molar concentration of 1.6 × 10-²M is 1.64 × 10-⁵.

Solubility is the amount of a substance that will dissolve in a given amount of a solvent, to give a saturated solution, under specified conditions.

PbCl₂(s) ⇌ Pb²⁺(aq) + 2Cl¯(aq)

The Ksp expression of lead chloride is as follows:

Ksp = [Pb²+] [Cl¯]²

There is a 1:1 molar ratio between PbCl₂ and Pb²⁺ but a 1:2 molar ratio between PbCl₂ and Cl.

Ksp = {1.6 × 10-²} {3.2 × 10-²}²

Ksp = 1.64 × 10-⁵

Therefore, 1.64 × 10-⁵ is the solubility constant of the lead (II) chloride.

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Answer:

1) atomic number

2) element symbol

3) element name

4) atomic mass

5) electron configuration

Answer:

Phosphorus

Explanation:

From the Bohr model of the given element we can interpret that:

Total number of electron = 15

Total number of proton = 15

Total number of neutron = 16

So, Mass of the element= Total number of proton+ Total number of electron

= 15 + 16

= 31 u

An atom that has 15 electron and mass have mass 31 amu is Phosphorus

The new volume of a gas 40ml, if 50 mL at 81.0 kPa has its pressure increased to 101.3 kPa.

What is Boyle's Law?

Boyle's law is a gas law that states that the pressure exerted by a gas (with a given mass and constant temperature) is inversely proportional to its volume. In other words, as long as the temperature and amount of gas remain constant, the pressure and volume of a gas are inversely proportional to each other. Boyle's law was proposed in 1662 by the Anglo-Irish chemist Robert Boyle.

Any change in the volume occupied by a gas (at constant quantity and temperature) results in a change in the pressure exerted by it, according to Boyle's law.

In other words, the product of a gas's beginning pressure and volume is equal to the product of its end pressure and volume (at constant temperature and number of moles).

P1V1 = P2V2

Where,

P1 denotes the gas's initial pressure.

V1 denotes the gas's initial volume.

P2 denotes the gas's final pressure.

V2 denotes the gas's final volume.

The pressure-volume relationship provided by Boyle's law can be used to get this phrase. PV = k for a fixed amount of gas kept at a constant temperature. Therefore,

P1V1 = k (starting pressure * starting volume)

P2V2 = k (last pressure * last volume)

∴ P1V1 = P2V2

According to Boyle's Law

p1v1=p2v2

81x50= 101.3xv2

v2 = 140ml

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In the formation of the sodium chloride, there is the loss of one electron from the sodium atom to the chlorine atom.

An ionic bond is the kind of bond that is formed between a metal and a non metal. The metal is known to donate electrons to the non metal. In the actual sense, the compound that is formed is an ion pair because the metal is positively charged while the non metal is negatively charged.

In the case of the sodium chloride, we know that the both elements, sodium and chlorine are highly reactive. Hence the sodium atom would quickly loose electrons to the chlorine atom and then the sodium chloride compound is formed.

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A weak base equilibrium as shown in the equation below.  the effect on Kb if  BH⁺ were added to the solution; the equilibrium constants  is remains unchanged.

The equation is given as :

B (aq) + H2O (l) ⇌ BH⁺ (aq) + OH⁻ (aq)

K = [ BH⁺ ] [ OH⁻] / [B]

the equilibrium constant  for the given reaction is remain unchanged. the equilibrium constant will only depends on the temperature of the reaction.

Thus, A weak base equilibrium as shown in the equation below.  the effect on Kb if  BH⁺ were added to the solution; the equilibrium constants  is remains unchanged.

B (aq) + H2O (l) ⇌ BH⁺ (aq) + OH⁻ (aq)

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When iron ( Fe ) reacts with copper sulphate ( CuSO₄) , it forms ferrous sulphate ( FeSO₄ ) and copper ( Cu ) .

Iron copper sulphate.

The lead nitrate [Pb(NO₃)₂] reacts with potassium iodide (Kl) causing exchange of ions between the reactants leading to the formation of potassium nitrate (KNO₃) and a yellow precipitate of lead iodide (PbI₂).

Magnesium reacts with hydrochloric acid according to the equation

Mg + 2 HCl --> MgCl₂  + H₂

Magnesium reacts with hydrochloric acid according to the equation This demonstration can be used to illustrate the characteristic reaction of metals with acid, a single replacement reaction, or to demonstrate the generation of hydrogen gas.

H₂O

Water splitting is the process in which water decomposes into hydrogen and oxygen.

Mg + O₂ → MgO.

Magnesium reacts with Oxygen to form Magnesium oxide.

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The weight percent of KCN and NaCN in the original sample are;

The weight percent of KCN and NaCN in the original sample is calculated as follows:

The mass of the original mixture of KCN and NaCN = 0.7256 g

The dissociation equation of the ionic compounds in an aqueous solution is given below:

KCN ⇄ K⁺ + CN⁻

NaCN ⇄ Na⁺ + CN⁻

Mass of precipitate of AgCN = 2.5874 g

Moles of AgCN in a 2.5874 g sample = mass / molar mass

molar mass of AgCN = 133.886 g/mol

Moles of AgCN in the sample = 2.5874 / 133.886

Moles of AgCN in the sample = 0.01932 moles

Moles of CN⁻ in the sample = 0.01932 moles

Mass of CN⁻ present in the sample = 0.01932 * 26

Mass of CN⁻ present in the sample = 0.50232 g

Moles of Na⁺ present = 0.01932 / 2 moles

Moles of Na⁺ present = 0.009663 moles

Mass of Na⁺ present = 0.00966 * 23

Mass of Na⁺ present = 0.2222 g

Moles of K⁺ present = 0.01932 / 2 moles

Moles of K⁺ present = 0.00966 moles

Mass of K⁺ present = 0.009663 * 39

Mass of K⁺ present = 0.3768 g

Mass of sample =  0.50232 g + 0.2222 g + 0.3768 g

Mass of sample = 1.10132 g

weight percent of KCN = (0.3768 + 0.50232/2)/1.10132 * 100%

weight percent of KCN = 57%

weight percent of NaCN = (100 - 57)%

weight percent of NaCN = 43%

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The answer is D. When an electron falls into the valence band to fill a hole, it gives up energy in the form of light.

The diode in an LED bulb is a semiconductor device that allows electricity to flow in one direction only. It is made of two pieces of semiconductor material, one positive and one negative, that are joined together.

The diode in the process of electrolysis has two terminals, called the anode and the cathode. The anode is the positive terminal and the cathode is the negative terminal in the electrolysis. The anode is connected to the positive terminal of the power supply and the cathode is connected to the negative terminal of the power supply.

When the power is turned on, the diode allows electricity to flow from the anode to the cathode and lights up the LED bulb.

The light-emitting diode will emit light when an electron jumps from the conduction band to the valence band. This is because when the electron falls into the valence band, it will release energy in the form of light.

Therefore the correct option is d.

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The reaction is exothermic in nature and the value of q in kJ is -1.12x10^3 kJ

The reaction is 2H₂S(g) + 3O₂(g)→→→→→→2H₂O(g) + 2SO₂(g)

The amount of heat evolved in the reaction = 1.12 X 103 KJ

2 moles of hydrogen sulphide react.

In an is In an endothermic reaction, energy is consumed. an exothermic reaction, energy evolved Thus, the given reaction is exothermic.

Exothermic reactions are those reactions in which the energy is evolved or released by the reaction.

And endothermic reactions are those reactions in which heat or energy is absorbed in the reaction.

Since the reaction is evolving energy.

Hence the reaction is an exothermic reaction.

The value of q is defined as the amount of heat transferred to the system.

Since the heat is going away from the system.

Hence the value of q will be -ve.

And the magnitude of q will be exactly the same as the amount of heat evolved by the reaction.

Hence q = -1.12 X 103 KJ  (-ve sign shows that heat is being evolved i.e exothermic process)

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A Lewis Structure can be defined as a very simplified representation of the valence shell electrons in a molecule. It explains how the electrons are arranged around individual atoms in a molecule.

Explain different terms mentioned above.

Lewis Structure :It was named  after Gilbert N who mentioned it for the first time in his book The Atom and the Molecule.

The Lewis Structure can be written as follows:

Step 1: Determine total valence electrons.

Step 2: Write the skeleton structure of the molecule

Step 3: Form bond in the skeleton structure using two valence electrons.

Step 4: Fulfil octet rule and segregate non bonding electrons.

Examples : In case of CO2, we can see

two double bonds between the carbon and oxygen atoms. According to octet rule each oxygen atom needs to bond with four different carbon atoms. Carbon has four valence electrons, which make a total of four bonds. So there are four dots around carbon.

Electron geometry :  It can be defined as the arrangement of electron pairs around a central atom. It can be given in such form :

linear, trigonal planar, tetrahedral, trigonal bipyramidal, or octahedral

Hybridisation : It can be defined as the intermixing of two atomic orbitals to give rise to new  hybridized orbitals. The hybrid orbitals formed have entirely different energies, shapes, etc.

Polarity : It can be defined as  the distribution of electrical charge over the atoms joined by the bond.

Hence, structure can be determined by knowledge of these factors.

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The statement that correctly defend or dispute his conclusion is option3:

A physical alteration occurs when salt water evaporates. Since the matter has merely changed states but still remains the same substance, any phase shift is a physical change.

Table salt dissolving in water is an example of a physical change because only the condition of the substance has changed. Frequently, physical changes can be undone. The salt will become solid once the water has evaporated.

It's not a given that salt and water's formation of a single phase indicates a chemical reaction. It simply indicates that the two substances mixed evenly.

Therefore, This is supported by the fact that the mixture's components could be easily separated using a straightforward physical technique called evaporation.

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See full question below
Henry mixed salt and water together in a cup until he observed a clear solution. He measured the mass of the solution. Then he placed the cup outside for several sunny days during the summer. After a week, he observed that only solid salt remained in the cup and the mass had decreased. Henry concluded that a physical and chemical change occurred in this investigation.

Which statements correctly defend or dispute his conclusion?

1- He is correct. Dissolving salt in water is a physical change, but evaporating the water is a chemical change. Formation of a solid is evidence that a chemical change occurred.

He is correct. Evaporation is a physical change, but dissolving salt in water is a chemical change. The change in mass is evidence that a chemical change occurred.

2- He is incorrect. Dissolving salt in water and evaporation of the water are both physical changes. The reappearance of salt is evidence that the change was reversible by a physical change, so it could not be a chemical change.

3- He is incorrect. Dissolving salt in water and evaporation of the water are both chemical changes. The reappearance of salt is evidence that the change was reversible by a chemical change, so it could not be a physical change.

The energy used to heat the iron from 25°C to 75°C will be 88J

Given,

m= 4 g

c, i.e, specific heat of Iron is 0.44 J°C⁻¹g⁻¹

The heat energy is given by  formula,

q=mcΔT

where q is the amount of heat and m is the substance's mass.

T represents the temperature change, and c is the material's specific heat capacity. The addition of heat affects various substances in varying degrees. Different materials' temperatures rise by different amounts when a given amount of heat is applied to them.

q =4× 0.44× ΔT

ΔT= T₂₋ T₁

ΔT= 75- 25

= 50°C

q= 4×0.44×50

=88 J

So, the energy used to heat the iron will be 88J.

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Answer:

See explanation, some might be graded as wrong if it's an automatic grading system but most

Explanation:

1. lose
2. valence
3. noble (Atoms don't actually always do this, but since the word gas is after the blank, it is the only option)

4. 4
5. have
6. 10

5 and 6 are a little ambiguous and could have many answers  

Morphine is used medicinally as a pain reliever. If an aqueous solution of morphine has [H3O⁺] = 1.1 x 10-10 M, the pH of this solution is 9.6.

given that :

[H3O⁺] = 1.1 x 10-10 M

the pH of the solution is given as :

pH = - log ( [H3O⁺] )

pH = - log (  1.1 x 10-10 M )

pH = - (-9.6 )

pH = 9.6

the pH of the given solution is 9.6.

Thus, Morphine is used medicinally as a pain reliever. If an aqueous solution of morphine has [H3O+] = 1.1 x 10-10 M, the pH of this solution is 9.6.

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