Question:
When mercuric iodide is added to the aqueous solution of potassium iodide
When mercuric iodide is added to the aqueous solution of potassium iodide
Updated On: July 22, 2025
- freezing point is raised
- freezing point is lowered
- freezing point does not change
- boiling point does not change
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The Correct Option is A
Solution and Explanation
Addition of Hgl$_2$ to KI solution establishes the following equilibrium:
$ \, \, \, \, \, \, \, \, \, \, \, \, HgI_2 +2KI \rightleftharpoons K_2[HgI_4]$
The above equilibrium decreases the number of ions (4 ions on left side of reactions becomes three ions on right side), hence rises the freezing point.
$ \, \, \, \, \, \, \, \, \, \, \, \, HgI_2 +2KI \rightleftharpoons K_2[HgI_4]$
The above equilibrium decreases the number of ions (4 ions on left side of reactions becomes three ions on right side), hence rises the freezing point.
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Concepts Used:
Solutions
A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.
For example, salt and sugar is a good illustration of a solution. A solution can be categorized into several components.
Types of Solutions:
The solutions can be classified into three types:
- Solid Solutions - In these solutions, the solvent is in a Solid-state.
- Liquid Solutions- In these solutions, the solvent is in a Liquid state.
- Gaseous Solutions - In these solutions, the solvent is in a Gaseous state.
On the basis of the amount of solute dissolved in a solvent, solutions are divided into the following types:
- Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
- Saturated Solution- A solution in which no solute can be dissolved after reaching a certain amount of temperature is known as an unsaturated saturated solution.
- Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.