Inorganic Chemistry Answers

How does the size of the A-site cation influence the ferroelectric properties of a perovskite type material?

Explain and compare the shapes of the polarisation vs. electric field curves of a dielectric and a ferroelectric material.

How is the perovskite structure type related to the rock salt structure type?

Why does a ferroelectric material require the absence of an inversion centre in its crystal structure?

8. When nitrogen gas reacts with hydrogen gas, ammonia gas is formed. If 0.95 g of hydrogen gas react with 4.75 g of nitrogen gas, which reactant will be the limiting reactant?

1 point

a. nitrogen gas

b. hydrogen gas

c. ammonia gas

d. Neither will be the limiting reactant.

e. The excess reactant must be determined experimentally.

The partition coefficient of a base B (monoacidic) at a particular pH, in an octanol-water mixture

is 1.45. Consider an experiment where 3.5 g of B are shaken with 100 mL of octanol and 50 mL

of water.

Molar mass of B = 101.19 g mol-1

(i) Calculate the mass of B in the aqueous layer after shaking. (4 marks)

(ii) Calculate the volume of 0.5 M HCl required to neutralize the aqueous layer

How many grams of ammonium chloride must be added to 0.050 kg of water to produce a

solution that freezes at -5.00 °C? The cryoscopic constant of water is 1.86 °C kg mol-1

. The

molar mass of ammonium chloride is 53.5 g mol-1

.

In an experiment, 13.88 g of potassium propionate, C2H5CO2K, were weighed in a beaker and

dissolved in a small amount of distilled water. The mixture is transferred to a 100 mL volumetric

flask, made up to the mark and shaken well. 50.0 mL of this standard solution is mixed with 50.0

mL of a standard solution of propionic acid, C2H5CO2H in order to prepare a buffer solution of

pH 5.66. The molar mass of potassium propionate is 112 g mol-1

and the pKa of propionic acid is

4.87.

(i) What is the concentration of the propionic acid used to make the buffer?

Give a chemical equation to show the effect of nitric acid on the buffer.

In an experiment, 13.88 g of potassium propionate, C2H5CO2K, were weighed in a beaker and

dissolved in a small amount of distilled water. The mixture is transferred to a 100 mL volumetric

flask, made up to the mark and shaken well. 50.0 mL of this standard solution is mixed with 50.0

mL of a standard solution of propionic acid, C2H5CO2H in order to prepare a buffer solution of

pH 5.66. The molar mass of potassium propionate is 112 g mol-1

and the pKa of propionic acid is

4.87.

(i) What is the concentration of the propionic acid used to make the buffer?