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Inorganic Chemistry
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
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
Inorganic Chemistry
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
.
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
.
Inorganic Chemistry
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?
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?
Inorganic Chemistry
Give a chemical equation to show the effect of nitric acid on the buffer.
Inorganic Chemistry
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?
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?
Inorganic Chemistry
_______23.The anode reaction is the same in all of the following electrolytic
cells except one:
A. Electrolysis of concentrated HCl solution
B. Electrolysis of dilute sodium chloride solution
C. Electrolysis of fuses lead chloride
D. Electrolysis of brine
cells except one:
A. Electrolysis of concentrated HCl solution
B. Electrolysis of dilute sodium chloride solution
C. Electrolysis of fuses lead chloride
D. Electrolysis of brine
Inorganic Chemistry
Which of the following is not a necessary condition for the
preferential discharging of ions?
A. The concentration of the ions
B. The distance between the electrodes
C. The nature of ions
D. The type of electrode used
preferential discharging of ions?
A. The concentration of the ions
B. The distance between the electrodes
C. The nature of ions
D. The type of electrode used
Inorganic Chemistry
14. Identify the one which is not feed into the blast furnace during the
extraction of iron
A. Iron ore C. Hot air
B. Coke D. Carbon dioxide
extraction of iron
A. Iron ore C. Hot air
B. Coke D. Carbon dioxide
Inorganic Chemistry
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.
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.
Inorganic Chemistry
Which of these alkali earth metals forms more complexes ?
