Question:

Ethylene glycol is used as antifreeze to reduce freezing point of water to $-2.4^{\circ}\,C$. What mass of antifreeze is required for $2\, L$ water? $(K_f \,water\, = \,1.86\, K \,kg/mole)$

Updated On: Jun 23, 2023
  • 16 kg
  • 160 g
  • 1.60 kg
  • 16 g
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The Correct Option is B

Solution and Explanation

$w_{solute}=\frac{\Delta T _{f} \times w_{water}\times M_{solute}}{K _{f}}$ $\quad\quad=\frac{2.4\times2\times0.062}{1.86}=160 g$ $\quad\quad\quad\quad$ [Mass of 2 L of water is 2 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:

  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.