A solution of KOH is prepared with a [OH-] concentration of 3.3 × 10-2 M. Calculate [H+], pH, and identify whether the solution is acidic, basic, or neutral.

Answers

Answer 1

Answer:

[H⁺] = 3.03x10⁻¹³ MpH = 12.52The solution is basic

Explanation:

We can first calculate [H⁺] by using the formula:

[H⁺] * [OH⁻] = 1x10⁻¹⁴[H⁺] * 3.3x10⁻² = 1x10⁻¹⁴[H⁺] = 3.03x10⁻¹³ M

Now we proceed to calculate pH:

pH = -log [H⁺]pH = -log (3.03x10⁻¹³)pH = 12.52

As the pH is higher than 7, the solution is basic.


Related Questions

Why does chemical changes lead to the formation of compounds.Justify ​

Answers

Answer:

The addition of energy  through the chemical reaction when substance combines and gets decomposed.

Explanation:

Chemical changes take place when the substance combines with some other to form a chemical synthesis and gets alternatively decomposed into 2 different substances through chemical reactions. As when the chemical reactions occur the atoms rearrange themselves. As these are accompanied by the energy changes. Such as those of sodium and water to produce sodium hydroxide and hydrogen. The chemical changes are found in organic, inorganic, and biochemical changes.

UNA ONDA SE MUEVE CON UNA FRECUENCIA DE 2 (HZ), Y SU RAPIDEZ DE PROPAGACIÓN ES DE 20 (m/s). ¿Cuál ES LA LONGITUD DE ONDA.

Answers

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what is the equation for the reaction between excess dry oxygen and iron fillings​

Answers

Answer:

Fe2 + O2 > FeO

Explanation:

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17. If the pOH of a solution is 4.5, What is the pH ?
A) 8.5
B) 7.5
C) 9.5
D) 7.0

Answers

Answer:

C)9.5

Explanation:

Given poH=4.5

find ph

from 14=ph+poh

14=ph+4.5

ph=9.5

which of the following elements has the highest electronegativity?

A) oxygen
B) nitrogen
C) carbon
D) boron​

Answers

The answer of this question is Oxygen

Answer:

option d) is the correct answer

Identify the gas law that applies to the following scenario: A 36.5 liter balloon holding 2.9 moles of carbon dioxide leaks. If we are able to determine that 1.2
moles of carbon dioxide escaped before the container could be sealed, what is the new volume of the container?
O Boyle's Law
Charles Law
Gay-Lussac's Law
Avogadro's Law

Answers

Answer:

Avogadro's Law

Explanation:

The amount of moles is directly proportional to the volume of the gas under constant temperature and pressure. That is the statement of Avogadro's law. The equation is:

V1n2 = V2n1

Where V is volume and n are moles of 1, initial state and 2, final state of the gas

That means, right option is:

Avogadro's Law

Complete and balance the following neutralization reaction, and estimate the
likely pH of the neutralization point. (3 pts)
Ca(OH)2 + HNO3 →

Answers

Answer:

we have a base-Ca(OH)2 and an acid - HNO3

→Their chemical reaction gives us water and salt Ca(NO3)+ H20 (neutralisation reaction)

the pH is expected to be acidic ... since nitric acid is a strong acid and calcium hydroxide is a weak base .

Explanation:

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For the simple reaction of A + B ---> C, if A is the limiting reactant for a certain set of conditions, then B is an excess reactant. True or False

Answers

Answer: True

Explanation:

Which family on the periodic table is least likely to enter into chemical reactions?
1
2
17
18

Answers

Answer:

the answer is seventeen

How many moles of Manganese there in are 5.76 x 10(15) atoms of Mn?
How many moles of sodium chloride are in a 431.6 g sample of NaCl?

Answers

Answer:

1. 9.57 × 10^-9 moles.

2. 7.38mol

Explanation:

1.) To find the number of moles there are in the number of particles in an atom, we divide the number of particles (nA) by Avagadro's constant (6.02 × 10^23)

Hence, to find the number of moles (n) of Manganese (Mn), we say:

5.76 x 10^15 atoms ÷ 6.02 × 10^23

5.76/6.02 × 10^(15-23)

= 0.957 × 10^-8

= 9.57 × 10^-9 moles.

2.) Mole = mass/molar mass

Molar mass of sodium chloride (NaCl) = 23 + 35.5

= 58.5g/mol

mole = 431.6 g ÷ 58.5g/mol

mole = 7.38mol

Which of the following is true of squalene, a hexa-unsaturated hydrocarbon
with a formula of C₃₀H₅₀, which melts at – 5°C and boils at 285 °C?

Answers

Answer: The alkyne

Explanation:

Answer:

the alkyne

Explanation:

Hope it helps u

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What is the pH of a solution with a 3.2 x 10−6 M hydronium ion concentration?

Answers

Answer:

5.49

Explanation:

The pH of a solution can be found by using the formula

[tex]pH = - log ([ { H_3O}^{+}])[/tex]

H3O+ is the hydronium ion

From the question we have

[tex]pH = - log(3.2 \times {10}^{ - 6} ) \\ = 5.49485..[/tex]

We have the final answer as

5.49

Hope this helps you

Si la masa de una muestra de un compuesto Y es de 196 gramos y contiene 2 mol, la masa molar de Y es

Answers

Answer:

98 g/mol

Explanation:

La masa molar de un compuesto es la cantidad de materia (medida como masa) que hay en 1 mol de dicho compuesto. Por lo tanto, puede calcularse como sigue:

masa molar = masa/número moles

Tenemos los siguientes datos del compuesto Y:

masa Y = 196 g

número de moles de Y = 2 mol

Entonces, podemos calcular la masa molar de Y de la siguiente manera:

masa molar Y = (masa Y)/(número de moles de Y) = 196 g/2 mol = 98 g/mol


What causes the pressure inside oxygen tanks to change as they are filled?

A. The temperature of the gas changes.
B. The volume of the container changes.
C. The pressure outside the tanks changes.
D. The number of gas molecules changes.

Answers

Answer:

The answer would be D.

: )

Explanation:

The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.

What are oxygen tanks?

Oxygen tanks are those in which the oxygen is filled in the liquid form by giving pressure to it with the help of a piston due to more pressure the molecules of oxygen become close.

As the molecule of the oxygen gas is closed to each other they are condensed and changes their state from a gaseous state to a liquid state.

By providing more pressure to the oxygen tank the gas molecules increases due to the decrease in the surface of the tank and molecules condense to liquid form.

Therefore, The number of gas molecules changes as the pressure inside oxygen tanks changes as they are filled. option D is correct.

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How many moles of calcium oxide are formed when 3 moles of calcium react with oxygen?

Answers

Answer:

3 moles of Calcium Oxide are formed

Explanation:

Based on the reaction of Calcium Ca, with oxygen, O₂, to produce calcium oxide, CaO is:

2Ca + O₂ → 2CaO

where 2 moles of calcium produce 2 moles of Calcium oxide.

That means, if 3 moles of Ca react in presence of oxygen:

3 moles of calcium oxide are formed

plzz help 20 points plzzzz​

Answers

The answer is: Element B


Which lunar phase is 21 days after the first quarter?

Answers

Answer:  waning gibbous

Explanation:

A student dissolves 0.112 mol sucrose in enough water to make 4.0 L of solution. What is the molarity of the solution

Answers

Answer: Molarity of the solution is 0.028 M.

Explanation:

Given : Moles of sucrose (solute) = 0.112 mol

Volume of solution = 4.0 L

Molarity is the number of moles of solute dissolved in a liter of solvent.

[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.112 mol}{4.0 L}\\= 0.028 M[/tex]

Thus, we can conclude that molarity of the solution is 0.028 M.


Equal volumes of nitrogen and oxygen, at the same temperature and
pressure, would:
a. have the same mass
b. contain the same number of particles
C. contain different numbers of particles
d. have different kinetic energies

Answers

Answer C : Contain different number of particles

Equal volumes of nitrogen and oxygen, at the same temperature and  pressure, would: b. contain the same number of particles.

Avogadro's law states that, equal volumes of all gas samples have the same number of atoms or molecules at the same temperature and pressure.

In Science, the Avogadro's number is typically used to determine the number of atoms or molecules that are contained in a certain mass of a chemical element.

Note: Avogadro's constant is equal to [tex]6.02 \times 10^{23}[/tex]

In conclusion, equal volumes of nitrogen and oxygen, at the same temperature and  pressure, would contain the same number of particles (atoms or molecules) in accordance with Avogadro's law.

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Calculate the pH of the solution:
[OH-] = 1x10^-11M
a.11.0
b.12.0
c.2.7
d.3.0

Answers

p [OH-] = -log[OH-]= -log ( 1x10^-11M) = 11

we know that

p[OH-] + p[H+] = 14

so p[H+] = 14- p[OH-] = 14- 11 = 3

pH = 3, answer

Which model could represent a neutral atom of nitrogen

Answers

Answer:

The answer is c.1. The atomic number of nitrogen is 7.

The electron arrangement of nitrogen is 2.5. With that said, atom 1 resembles the neutral atom of nitrogen because the innermost shell of the atom contains 2 electrons while the outermost shell of the atom contains 5 electrons.

The model that could represent a neutral atom of nitrogen is the first one. Thus, the correct option is C.

What is a Nitrogen atom?

A nitrogen atom may be defined as a chemical element with an atomic number of 7 and an atomic mass of 14.  It contains seven protons in its nucleus.

Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table. Being neutral, the number of protons that it has in its nucleus must be equal to that of the surrounding electron. Hence, the number of electrons are seven.

These seven electrons are only visible in the first model. Thus, the correct option for this question is C.

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Which fraction contains the largest molecules?
A) diesel
B)gasoline
C)kerosene?

Answers

Answer:

Hydrocarbons

Hydrocarbons are chemical compounds that contain the elements carbon and hydrogen only. They are compounds that are obtained from the fossil fuel crude oil by a process called fractional distillation.

Fractional distillation

Fractional distillation separates the crude oil mixture into a number of smaller, different parts called fractions. The fractionating column is hot at the bottom and cool at the top. Substances with high boiling points condense at the bottom and substances with lower boiling points condense on the way to the top.

The crude oil is evaporated and its vapours condense at different temperatures in the fractionating column. Each fraction contains hydrocarbon molecules with a similar number of carbon atoms, smaller molecules nearer the top and longer molecules nearer the base of the column.

Oil fractions

The diagram below summarises the main fractions from crude oil and their uses and the trends in properties. Note that the gases leave at the top of the column, the liquids condense in the middle and the solids stay at the bottom.

Explanation:

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The substances which are generally used to generate heat and light energy on burning are called fuels. The diesel fuel contains the largest molecules. Thus option A is correct.

What is Diesel?

The diesel fuel which is also called the diesel oil is found to be a combustible liquid and it is produced from the fractions of crude oil. The diesel fuel is found to be less volatile than the gasoline.

The chemical composition of a diesel fuel is usually denoted as C₁₂H₂₄. Apart from the carbon and hydrogen atoms small amounts of 'S', 'N' and 'O' are also present in the diesel.

Here gasoline is a derivative product obtained by the fractional distillation of crude oil and it is generally used in passenger vehicles whereas kerosene is a highly flammable liquid obtained from the distillation of petrol and is less volatile than gasoline.

The gasoline contains only 4 to 12 'C' atoms per molecule and it is a lightweight hydrocarbon mixture. The number of 'C' atoms in kerosene ranges from 10 to 16 per molecule and the diesel fuel is known as the heavyweight hydrocarbon mixture with 8 to 21 'C' atoms per molecule.

Thus diesel fuel consists of larger hydrocarbon molecules than gasoline and kerosene.

Thus the correct option is A - Diesel.

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Question 25 of 33
Which statement describes a periodie trend of brstionization energy?
A It tends to increase from top to bottom of a group
B. It remains the same within a period
c. It tends to decrease from top to bottom of a group
D. It tends to decrease from left to right across a period

Answers

Answer:

A) It tends to increase from top to bottom of a group

Under similar conditions, which gas diffuses most rapidly through a small
opening?
a. Methane, CH4
b. Carbon dioxide
C. Sulfur dioxide
d. Oxygen
e. Chlorine

Answers

The answer might be carbon dioxide

Answer:

e

Explanation:

a

Conclusion:

sports

A scientist wants to test the effectiveness of a medicine in treating
headaches. He puts the medicine into cookies and then tells his subjects to
lie down and have a cookie when they have a headache. He asks them to give
him feedback about how well these relaxation techniques work to cure their
headaches. What rule of ethics does this experiment break?
O A. The subjects are not informed that they are taking a medicine.
B. It is likely to harm his subjects.
C. The scientist is taking the work of others by reviewing the
subjects' feedback.
D. It is testing more than one variable at the same time.​

Answers

C) is correct

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1. How much heat is required to raise the temperature of 4.64kg of lead from 150°C to 219°C?

Answers

Answer: An amount of [tex]40980.48 J/g^{o}C[/tex] heat is required to raise the temperature of 4.64kg of lead from 150°C to 219°C.

Explanation:

Given: mass of lead = 4.64 kg

Convert kg into grams as follows.

[tex]1 kg = 1000 g\\4.64 kg = 4.64 kg \times \frac{1000 g}{1 kg}\\= 4640 g[/tex]

[tex]T_{1} = 150^{o}C[/tex]

[tex]T_{2} = 219^{o}C[/tex]

The standard value of specific heat of lead is [tex]0.128 J/g^{o}C[/tex].

Formula used to calculate heat is as follows.

[tex]q = m \times C \times \Delta T[/tex]

where,

q = heat energy

m = mass of substance

C = specific heat of substance

[tex]\Delta T[/tex] = change in temperature

Substitute the value into above formula as follows.

[tex]q = m \times C \times \Delta T\\= 4640 g \times 0.128 J/g^{o}C \times (219 - 150)^{o}C\\= 40980.48 J/g^{o}C[/tex]

Thus, we can conclude that [tex]40980.48 J/g^{o}C[/tex] heat is required to raise the temperature of 4.64kg of lead from 150°C to 219°C.

What of the following is NOT a common property of metals?

Answers

Answer:

the last one

Explanation:

liquid at room temp

How many kilojoules of heat must be transferred to a 480-g aluminum pizza pan to raise its temperature from 22°C to 234°C? The specific heat of aluminum in this temperature range is 0.96 J/g.°С. Show your work.​

Answers

Answer:

97.7 kJ

Explanation:

We'll use the formula for specifc heat: Q=mcΔT

Q= heat/energy (Joules), m= mass (grams), c= specific heat (different for each substance and is usually given)

ΔT= final temperature - initial temperature

Let's check our given units and see if they're the correct, here they all are. Let's plug in what we know.

Q=mcΔT

Q=(480)(0.96)(234 - 22)

Q=(480)(0.96)(212)

Q= 97,690 J

Before we submit an answer, let's check out units. We have our answer in Joules, but we want it it kilojoules, so we'll convert it knowing that:

1000 Joules = 1 kilojoule

97,690J x [tex]\frac{1 kJ}{1000J}[/tex] = 97.7kJ

Explanation:

the answer and the working out is shown above.

A gas occupies 12.3 L at a temperature of 40.0 K. What is the volume when the temperature is increased to 60.0 K?

Answers

Answer:

the volume is 18.45 L

Explanation:

The computation of the volume when the temperature is increased to 60.0 K is shown below:

Since the gas occupied 12.3 L at a temperature of 40.0 k

And, the volume when the new temperature is 60.0 k

So, the volume is

= 60.0 k × 12.3 L ÷ 40.0 k

= 18.45 L

hence,  the volume is 18.45 L

what will happen when the rates of evaporation and condensation are equal​

Answers

a random person put the answer for you
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