A 1.2 M solution of a weak base B is prepared. Using a pH meter, the pH is measured to be 11.82. Calculate the base ionization constant
Answer:
Kb = 3.64x10⁻⁵
Explanation:
First we calculate the pOH of the solution:
pOH = 14 - pHpOH = 2.18Then we calculate [OH⁻]:
pOH = -log[OH⁻][OH⁻] = [tex]10^{-pOH}[/tex][OH⁻] = 0.0066 MFor a weak base solution with a relatively high concentration, we can use the following formula:
[OH⁻] = [tex]\sqrt{Kb*C}[/tex]Where C is the concentration of the weak base solution (1.2 M in this case).
With the formula above we can calculate Kb:
0.0066 = [tex]\sqrt{Kb*1.2}[/tex]Kb = 3.64x10⁻⁵do weight loss Subliminals work?
Answer:
Some early research suggests that subliminal messages may influence food- and diet-related thoughts and behaviors. However, other research has found that subliminal messages with weight loss cues have no effect.
Explanation:
Which of the following accurately describes the orbital path of most planets in our solar system?
The orbital path is in a perfect circle.
The orbital path looks circular.
The orbital path is in a large elliptical shape.
The orbital path varies greatly from planet to planet.
I have a Helium party balloon that can hold 3.0 liters of gas. If I blow up this balloon with 0.10 moles of oxygen gas at a pressure of 1.0 atmosphere, what is the temperature of the balloon?
Answer:
I am not yet sure on my answer
I would not want to give you wrong answers
Sorry
Calculate the molarity of a solution prepared by dissolving 6.87 grams of AgNO3 in enough water to make 2.50 liters of solution.
Answer:
The molarity of the solution is 0.016 [tex]\frac{moles}{L}[/tex]
Explanation:
Molar concentration is a measure of the concentration of a solute in a solution.
Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
Molarity is determined by dividing the moles of the solute by the volume of the solution:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Being 169.87 g / mole the molar mass of AgNO₃, then you can apply the following rule of three: if 169.87 grams are contained in 1 mole, 6.87 grams are contained in how many moles?
[tex]amount of moles=\frac{6.87 grams*1 mole}{169.87 grams}[/tex]
amount of moles= 0.04 moles
Then:
number of moles of solute: 0.04 molesvolume: 2.50 LReplacing:
[tex]Molarity=\frac{0.04 moles}{2.50 L}[/tex]
Solving:
Molarity= 0.016 [tex]\frac{moles}{L}[/tex]
The molarity of the solution is 0.016 [tex]\frac{moles}{L}[/tex]
1. Newton’s second law of motion describes the relationship between force, mass, and acceleration. Write the equation.
Answer:
F=ma where F = force in N, m = mass in g and a = acceleration in [tex]m/s^{2}[/tex]
Can the solubility rules be used to find the state of any compound?
Answer:
yes
Explanation:
solubility rules allow prediction of what products will be insoluble in water.
how humans can improve the negative aspects of soil use FULL SENTENCES 50 POINTS PLEASE HELP
Answer:
Using diverse nutrient sources can help maintain soil health. Manure and compost add organic matter as well as an array of nutrients, but using just compost or manure to meet the nitrogen needs of the crop every year can result in excessive phosphorus levels in the soil.
where are human cells located (in living organisms)
the answer has to be 3 to 5 sentences for me to get full credit. ❤❤
What’s the answer please give me the answer
Answer:
replication
:D
The importance of improving soil usage FULL SENTENCES 50 POINTS HELP PLEASE
An experiment was conducted to see which metal pot would be better for cooking food quickly. The table below shows how quickly small pieces of wax melted during the experiment.
Type of metal
Time for the wax to melt (seconds)
Aluminum
27
Bronze
45
Copper
15
Steel
80
The following statement was made after the data were examined: “Copper pots are the best pots for cooking food quickly.” Which term best describes this statement?
conclusion
hypothesis
procedure
result
Answer:
Conclusion.....hope this helps
Answer:
conclusion
Explanation:
___ SeCl6 + ___ O2 --> ___ SeO2 + ___ Cl2
What is the balanced equation for these reactions?
I give Brainliest! Please no links
Answer:
SeCl₆ + O₂ → SeO₂ + 3Cl₂
Explanation:
Unbalanced:
SeCl₆ + O₂ → SeO₂ + Cl₂
Count the atoms.
On the left side, we have 1 Se atom, 6 Cl atoms, and 2 O atoms.
On the right side, we have 1 Se atom, 2 O atoms, and 2 Cl atoms.
So everything is balanced except for Cl. To balance, we put a 3 coefficient in front of Cl₂.
SeCl₆ + O₂ → SeO₂ + 3Cl₂
c:
1. The largest particles that a stream deposits as it enters a pond are 8 centimeters in diameter. The
minimum velocity of the stream is approximately
1) 100 cm/sec 2) 200 cm/sec 3) 300 cm/sec 4) 400 cm/sec
56.8 grams of glucose is dissolved in acetic acid. The boiling point of the acetic acid raises to 126.6°C. What is the molal concentration of the solution?
Answer:
Molal concentration of glucose = 2.64 m
Explanation:
The excersise can be solved by the formula for colligative property, elevation of boiling point.
ΔT = Kb . m . i
As glucose (C₆H₁₂O₆) is an organic compound, i = 1. (No ions generated)
ΔT = Boiling T° for solution - Boiling T° of pure solvent
Kb = Ebulloscopic constant.
We need data from acetic acid.
Boiling T° of pure solvent: 118.1°C
Kb = 3.22 °C/m
We replace data:
126.6°C - 118.1°C = 3.22°C/m . m . 1
(126.6°C - 118.1°C) / 3.22 m/°C = m
Molality = 2.64 mol/kg
Cualquier liquido a 25°C de temperatura y al nivel del mar a) adquiere una forma y volumen definido b) posee la forma del recipiente que lo contiene y ocupa un volumen constante c) no tiene forma ni volumen definidos d) tiene estructura cristalina
Answer:
b) posee la forma del recipiente que lo contiene y ocupa un volumen constante
Explanation:
Hay tres estados de la materia;
Sólido
Líquido
Gas
En estado líquido, la materia no tiene forma ni volumen definidos. Esto implica que la materia adquiere la forma del recipiente en el que se encuentra.
El líquido tiene un volumen definido. No ocupa el volumen del envase.
More about this source textSource text required for additional translation information
when copper wires are made, a copper rod is pulled into a narrower wire. Explain how metallic bonding allows this to happen
Answer:
possibly because of the malleability of metals
Explanation:
In metallic bonding, electrons are delocalized and move freely among nuclei. When a force is exerted n the metal, the nuclei shift, but the bonds do not break, giving metals their characteristic malleability.
How are the testes and the ovaries similar?
They are part of the human skeleton.
They are reproductive organs.
They are sensory organs.
They produce sperm.
can anyone help me with this question please! asap
Answer:
The correct answer to that question is glaciers, waves, wind.
Answer:
I think it is D but I could be wrong.
Explanation:
How to Convert 0.75g of nitrogen gas (N2) to liters.
24
N2=22.4 liters
18g=22.4 litters
18÷.75=24
In at least 4 complete sentences, describe the similarities and differences between Avogadro's Law and Charles' Law.
answer
Avogadro's law states that, at constant temperature and pressure, the volume of a gas is directly proportional to the number of moles present. In other words, equal volumes of gases at the same pressure and temperature contain the same number of molecules - this is true regardless of their physical properties or chemical nature.
This number of molecules is
6.022
⋅
10
23
and is known as Avogadro's number,
N
A
.
Matematically, Avogadro's law can be written like this
V
n
=
c
o
n
s
t
, or, better yet,
V
1
n
1
=
V
2
n
2
.
Avogadro's law, as well as Boyle's law and Charles' law, are special cases of the ideal gas law,
P
V
=
n
R
T
. If temperature and pressure are kept constant, and knowing that
R
is of course constant, then
P
V
=
n
R
T
→
P
V
n
=
R
T
→
V
n
=
R
T
P
=
c
o
n
s
t
, which represents Avogadro's law.
The ideal gas law can also be written to incorporate
N
A
, since the number of moles are actually the number of molecules divided by Avogadro's number
P
V
=
N
N
A
⋅
R
T
, where
N
represents the number of molecules.
I’d appreciate any help
Answer:
27 g
Explanation:
From the question,
n = Mv...................... Equation 1
Where n = number of mole of Al₂SO₄, M = Molarity of Al₂SO₄, v = Volume of the solution.
Given: M = 0.12 mol/L, v = 1.5 L.
Substitute these values into equation 1
n = 0.12×1.5
n = 0.18 mol
Also,
n = Mass(m)/Molar mass (m')
n = m/m'.
m = n×m'......................... Equation 2
Given: The molar mass of Al₂SO₄ = (27×2)+32+(16×4) = 150 g/mol
Substitute into equation 2
m = 0.18×150
m = 27 g
Can rotation and revolution occur at the same time? Explain.
Answer:
yes
Explanation:
Revolution is the movement of an object around another object. So, Earth revolves around the Sun, and the Moon revolves around Earth. At the same time, Earth and the Moon are also rotating. Earth's rate of revolution is about 365 days (one year), and its rate of rotation is about 24 hours (one day).
9. Why do bees pollinate flowers?
A. They want to get to food in the flower.
B. They want to make seeds.
C. They want to help the flowers reproduce.
D. They want protection.
Explanation: B.
Bees pollinate in order to sweeten their seed
Answer:
A
Explanation:
Bees make excellent pollinators because most of their lives is spent collecting pollen which acts as a protein to feed their offspring
Pick 1 answer, please help!
Answer:
B
Explanation:
Answer: D
Explanation: no explanation just D
How is a sound wave transmitted? Please help me I have a test.
Answer: energy is transferred through vibration of air particles or particles of a solid through which the sound travels.
Answer:
Sound is transmitted by vibrating a object and the waves move through particles.
Explanation:
Thermal energy is measurement of what type of molecular energy? *
Answer:
Kinetic energy!
Explanation:
It measures the average kinetic energy of the molecules of a substance in degrees Fahrenheit (F) or Celsius (C).
Have a good day!!
How is energy from grass passed on between animals
Answer:
its nuber 3
wdPDAPS
Explanation:
How many moles of KClO3 are needed to produce 480 grams of O2?
Answer:
2:3
You'd need 33.3 moles of potassium chlorate, KClO3 , to produce that much oxygen. Notice that you have a 2:3. mole ratio between potassium chlorate and oxygen gas, which means that, regardless of how many moles of the former react, you'll always produce 3/2 times more moles of the latter.
Explanation: