# Differentiate between molarity and molality of a solution. How can we change the molality value of a solution into molarity value?

Answer:

 Molarity Molality Molarity of a given solution is defined as the total number of moles of solute per litre of solution. Molality is defined as the total moles of a solute contained in a kilogram of a solvent. Mathematical expression is M = number of moles of the solute /Volume of solution given in terms of litres. Mathematical expression is m = Numbers of moles of solute/Mass of solvent in kgs m = (g ✕ 1000)/(W ✕ m). Depends on volume of the whole solution. Depends on the mass of the solvent. Unit sign expressed as (M). Unit sign expressed as (m). Molarity has a unit of moles/liter. Molality has units of moles/kg.

The relationship between the molarity (M) and molality (m) is expressed as below.

$m= frac{1000times M}{1000times (d-M)times M^{‘}}$

M = Molarity.

m= Molality.

M’ = Molar mass of the solute.