Question:
What would be the molality of $20\%$ (mass / mass) aqueous solution of $KI$?
(molar mass of $KI = 166\, g\, mol^{-1}$)
What would be the molality of $20\%$ (mass / mass) aqueous solution of $KI$?
(molar mass of $KI = 166\, g\, mol^{-1}$)
Updated On: Jun 24, 2024
- 1.08
- 1.48
- 1.51
- 1.35
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The Correct Option is C
Solution and Explanation
$\frac{W}{W} \% = 20$
$100\, gm$ solution has $20\, gm\, KI$
$80 \,gm$ solvent has $20\, gm\, KI$
$ m = \frac{\frac{20}{166}}{\frac{80}{1000}} = \frac{20\times1000}{166\times80} = 1.506 \simeq 1.51 \,mol/kg$
$100\, gm$ solution has $20\, gm\, KI$
$80 \,gm$ solvent has $20\, gm\, KI$
$ m = \frac{\frac{20}{166}}{\frac{80}{1000}} = \frac{20\times1000}{166\times80} = 1.506 \simeq 1.51 \,mol/kg$
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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.