At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is
At equilibrium the rate of dissolution of a solid solute in a volatile liquid solvent is
The correct option is A The rate of dissolution of solute in a volatile liquid solvent is equal to the rate of crystallization.
Explanation for correct option:
(A) The rate of dissolution of solute in a volatile liquid solvent is equal to the rate of crystallization.
- The process of precipitating solid crystals from a solution, melting, or, less frequently, a gas is known as crystallisation.
- At equilibrium, the forward reaction rate is equal to the backward reaction rate.
- During this time, the reactant concentration and the product concentration are both at equilibrium.
- We can assume that crystallisation is the backward reaction and that dissolution is the forward reaction.
- So, at equilibrium, the rate of dissolution of solute in a volatile liquid solvent is equal to the rate of crystallization. So, this is the correct option.
Explanation for incorrect option:
(B) The rate of dissolution of a solute in a volatile liquid solvent is greater than the rate of crystallisation in an unsaturated solution.
- The rate of crystallisation in an unsaturated solution cannot, at equilibrium, be faster than the rate of solute dissolution in a volatile liquid solvent. so this is an incorrect option.
(C) The rate of dissolution of a solute in a volatile liquid solvent is less than the rate of crystallisation in a supersaturated solution.
- In an unsaturated solution at equilibrium, the rate of dissolution of a solute in a volatile liquid solvent cannot be lesser than the rate of crystallisation. so this is an incorrect option.
Hence, the correct option is (A) The rate of dissolution of solute in a volatile liquid solvent is equal to the rate of crystallization.
The rate of dissolution of solute in a volatile liquid solvent is equal to the rate of crystallization.
Explanation for correct option:
(A) The rate of dissolution of solute in a volatile liquid solvent is equal to the rate of crystallization.
- The process of precipitating solid crystals from a solution, melting, or, less frequently, a gas is known as crystallisation.
- At equilibrium, the forward reaction rate is equal to the backward reaction rate.
- During this time, the reactant concentration and the product concentration are both at equilibrium.
- We can assume that crystallisation is the backward reaction and that dissolution is the forward reaction.
- So, at equilibrium, the rate of dissolution of solute in a volatile liquid solvent is equal to the rate of crystallization. So, this is the correct option.
Explanation for incorrect option:
(B) The rate of dissolution of a solute in a volatile liquid solvent is greater than the rate of crystallisation in an unsaturated solution.
- The rate of crystallisation in an unsaturated solution cannot, at equilibrium, be faster than the rate of solute dissolution in a volatile liquid solvent. so this is an incorrect option.
(C) The rate of dissolution of a solute in a volatile liquid solvent is less than the rate of crystallisation in a supersaturated solution.
- In an unsaturated solution at equilibrium, the rate of dissolution of a solute in a volatile liquid solvent cannot be lesser than the rate of crystallisation. so this is an incorrect option.
Hence, the correct option is (A) The rate of dissolution of solute in a volatile liquid solvent is equal to the rate of crystallization.
