Question

Which is not affected by temperature? (a) normality (b) molarity (c) molality (d) molality, molarity?

Answer 1

Hey
Here is your answer
C) molality.
Hope it helps you!

Answer 2

Answer: Option (c) is the correct answer.

Explanation:

Molarity is the number of moles of solute dissolved in liter of solution. This means that molarity is dependent on volume of solvent.

Mathematically, molarity = $\frac{n_{solute}}{liter of solution}$

Normality is the weight of solute per liter of solution. This means that normality is dependent on atomic mass and volume of solution.

Mathematically, normality = $\frac{equivalent weight/mass of solute}{liter of solution}$

Molality is the number of moles of solute dissolved in kilogram of solvent. This means that molality is dependent on mass of solvent.

Mathematically, molality = $\frac{n_{solute}}{mass_{solvent}}$

Thus, when we increase the temperature there will be change in the volume of solution or solvent. Thus, this change will affect the value of molarity and normality because both of them are dependent on volume.

Whereas molality will not be affected by temperature because it depends on the mass. Even if the volume will change, the mass of solute or solvent in the solution will remain the same.

Thus, we can conclude that molality will not be affected by temperature.