Physical Chemistry Answers

Discuss the Hittorf method of determination of transport number.

What is the molarity of an aqueous solution of ammonia for which the −OH in concentration is
1.0 ×10-3 M? 5
b 1.8 10 .

An aqueous solution containing 10.00 ×10-4 kg of a solute in 8.00 ×10-2 kg of water was found to
freeze at 272.72 K. Calculate the molar mass of the solute. Molar enthalpy of fusion of ice at its
melting point 273.15 K is 6021 J mol-1.

What is critical solution temperature? Describe liquid pairs which have
(i) upper CST,
(ii) lower CST, and
(ii) both upper and lower CST.

In a solution 0.200 kg each of water and ethanol are present. Calculate the mole fraction of each
component.

Define enthalpy of neutralisation. Why is its value constant for strong acid-strong base
neutralisation? Why is its value different if a weak acid is used in place of the strong acid

State Bragg Law. What assumptions were made by Bragg in deriving Bragg equation?

Define the following terms:
(i) Catalyst
(ii) Adsorption

Deduce the SI units for the gas constant, R.

On addition of a solute, the vapor pressure of a liquid reduced to 9/10th of its original value. If 2 gram of solute (molar mass = 100) is added to 100 grams of the liquid to achieve that reduction then find the molar mass of the solvent assume ideality.