Question

In which mode of expression, the concentration of solution remains independent of temperature?

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

Answer 1

The correct option is D Molality

Molarity depends on temperature.

$M\propto \frac{1}{V}\propto \frac{1}{T}$

$V=$ Volume, $T=$ Temperature

$Normality=Molarity\times n_{factor}$.

So, it depends upon temperature.

$Formality=\frac{No.ofgramformulamassesdissolved}{Volume\left(Litres\right)}$

So, Formality also depends on temperature.

$V\propto T$

Molality is the one which depends upon the mass of the solute and the solvent.

The mass is independent of temperature.

Thus, molality is independent of temperature.