Question:

The freezing point of a solution prepared from 1.25 g of non-electrolyte and 20 g of water is 271.9K. If molar depression constant is 1 86 $K m^{-1}$ then molar mass of the solute will be

Updated On: Jun 23, 2023
  • 105.7
  • 106.7
  • 115.3
  • 93
Hide Solution
collegedunia
Verified By Collegedunia

The Correct Option is D

Solution and Explanation

$ \Delta T _{ f }=\frac{1000 K _{ f } \times W _{2}}{ Mw _{2} \times W _{1}} $ $ [\Delta T =273-271.9=1.25] $ $ 1.25=\frac{1000 \times 1.86 \times 1.25}{ Mw _{2} \times 20} $ $Mw _{2}=93$
Was this answer helpful?
0
0

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:

  1. Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
  2. 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.
  3. Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.