Question

In which mode of expression, the concentration of a solution remains independent of temperature?
(IIT-JEE, 1988)

• A. Molarity
• B. Normality
• C. Formality
• D. Molality

Answer 1

The correct option is D Molality

Molarity, normality, and formality are calculated against the volume of the solution. The volume of the solution changes with change in temperature; therefore, these quantities do not remain constant with temperature.

Molarity (m) $=\frac{Molesofsolute}{Massofsolventinkg}$

The molality of a solution remains independent of temperature because it involves only mass, which is independent of temperature.