Question

Explain the effect of temperature molarity and molality of a solution.

Answer 1

Hint: We know that the temperature comes under the physical quantity. The molarity and molality both are dependent on the number of moles.

Complete step by step answer:
Let’s first discuss the basic difference between molarity and molality.
The molarity is the molar concentration of any solution and determined through the volume and the moles. The formula for molarity is depicted below.
${\rm{Molarity}} = \dfrac{{{\rm{Moles}}}}{{{\rm{Volume}}}}$
On the other hand, the molality can be described by the amount of moles of respective solute generally present in the ${\rm{1000}}\;{\rm{g}}$ of solvent. The formula for molality is shown below.
${\rm{Molality}} = \dfrac{{{\rm{Moles}}\;{\rm{of}}\;{\rm{solute}}}}{{{\rm{1000}}\;{\rm{g}}\;{\rm{of}}\;{\rm{solvent}}}}$
As we all know that, the temperature affects the molarity for the reason that it is based on the volume of the aqueous solution, and the volume of the substituents will be affected by the changes in temperature and the temperature decreases with the decreasing in the volume and temperature is increases with the increase in the volume.
The molality can usually be described by the number of moles of the solute for every kilogram of the solvent. The solutions’ molality does not change through the temperature of that aqueous solution. In the case of molality, it is the fraction of the moles to mass or weight of substituents, and the mass is the same at any temperature. Hence, molality does not affect the temperature change.

Note:
The temperature affects the molarity of the solution, but it does not affect the molality of the aqueous solution. One should keep in mind that temperature shows zero effect on mass.