Question:
A solution containing 6.8 g of non-ionic solute in 100 g of water was found to freeze at -0.93 $^\circ$C.$K_f$ for water is 1.86, If the mol. mass of solute is
A solution containing 6.8 g of non-ionic solute in 100 g of water was found to freeze at -0.93 $^\circ$C.$K_f$ for water is 1.86, If the mol. mass of solute is
Updated On: Jun 23, 2023
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The Correct Option is D
Solution and Explanation
$\Delta T_{f}=k_{f} m$
$m=$ mola city
$0.93=1.86 \times \frac{6.8}{M \times 0.1}$
$M=$ molar mass of solute
$M=\frac{6.8 \times 1.86}{0.43 \times 0.1}$
$m=136 \,gm / mole$
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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.