Question:
Concentration terms like mass percentage, ppm, mole fraction and molality do not depend on temperature. However, molarity is a function of temperature because
Concentration terms like mass percentage, ppm, mole fraction and molality do not depend on temperature. However, molarity is a function of temperature because
Updated On: Jun 23, 2023
- volume depends on temperature and molarity involves volume
- molarity involves non-volatile solute while all other terms involve volatile solute
- number of moles of solute change with change in temperature
- molarity is used for polar solvents only
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The Correct Option is A
Solution and Explanation
Molarity $=\frac{\text { no. of moles }}{\text { Volume of solution }( L )}$
When temperature increases the volume of the solution decreases assuming the solution is in constant pressure conditions.
$T \alpha \frac{1}{ V }$
Therefore when temperature increases volume decreases and molarity increases.
Mass percentage, ppm, mole fraction and molality are solely dependant on mass which is independent of temperature.
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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.