Question:
A 0.5 percent solution of potassium chloride was found to freeze at –0.24°C. The percentage dissociation of potassium chloride is ______. (Nearest integer)
(Molal depression constant for water is 1.80 K kg mol–1 and
molar mass of KCl is 74.6 g mol–1)
A 0.5 percent solution of potassium chloride was found to freeze at –0.24°C. The percentage dissociation of potassium chloride is ______. (Nearest integer)
(Molal depression constant for water is 1.80 K kg mol–1 and
molar mass of KCl is 74.6 g mol–1)
(Molal depression constant for water is 1.80 K kg mol–1 and
molar mass of KCl is 74.6 g mol–1)
Updated On: Jan 10, 2025
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Correct Answer: 98
Solution and Explanation
\(ΔT_f=iK_bm\)
\(i=\frac {(0.24×99.5×74.6)}{(1.80×0.5×1000)}=1.98\)
\(i=1.98\)
The dissociation of potassium chloride
\(α=\frac {i-1}{n-1}\)
\(α=\frac {0.98}{1}\)
\(α=0.98\)
The percentage dissociation of potassium chloride \(98\).
\(i=\frac {(0.24×99.5×74.6)}{(1.80×0.5×1000)}=1.98\)
\(i=1.98\)
The dissociation of potassium chloride
\(α=\frac {i-1}{n-1}\)
\(α=\frac {0.98}{1}\)
\(α=0.98\)
The percentage dissociation of potassium chloride \(98\).
So, the answer is \(98\).
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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.