Question

Which of the following modes of expressing concentration is independent of temperature ?
(a) Molarity
(b) Molality
(c) Formality
(d) Normality

Answer 1

molality will be right answer

Answer 2

Molality is the mode of expressing concentration which is independent of temperature.

Explanation:

• Molality is the number of moles present in kilogram of solution. Mathematically, expression for molality is as follows.

      Molality = $\frac{\text{no. of moles}}{\text{mass in kg}}$

As we increase the temperature of a solution then there occurs no change in its mass as well as no change in its number of moles. As a result, there will occur no change in molality of the solution.

• Molarity is the number of moles present in liter of solution. So, with change in temperature there occurs change in volume of the solution. Hence, molarity will also change.

• Normality is no. of gram equivalents per liter of solution. And, formality is no. of formula masses of the solute present in per liter of solution.

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