Molarity is defined as the number of moles of solute per liter of solution. It is represented by the symbol M and is expressed in moles per liter (mol/L).


Molarity (M) = Number of moles of solute / Volume of solution in liters


- It is temperature dependent
- It is affected by the change in volume
- It is used for solutions where the solvent is water
- It is used for reactions that occur in a solution


Molality is defined as the number of moles of solute per kilogram of solvent. It is represented by the symbol m and is expressed in moles per kilogram (mol/kg).


Molality (m) = Number of moles of solute / Mass of solvent in kilograms


- It is temperature independent
- It is not affected by the change in volume
- It is used for solutions where the solvent is not water
- It is used for colligative properties such as boiling point elevation and freezing point depression


- Molarity is expressed in terms of volume whereas molality is expressed in terms of mass.
- Molarity is affected by the change in volume whereas molality is not.
- Molarity is temperature dependent whereas molality is temperature independent.
- Molarity is used for solutions where the solvent is water whereas molality is used for solutions where the solvent is not water.
- Molarity is used for reactions that occur in a solution whereas molality is used for colligative properties such as boiling point elevation and freezing point depression.


Both molarity and molality are used to express the concentration of a solution but they differ in their characteristics and applications. Molarity is used for reactions that occur in a solution while molality is used for colligative properties such as boiling point elevation and freezing point depression.