Question

What is the unit of molarity?

Answer 1

• Molarity is a measure of concentration and is defined as the number of moles of solute present per unit volume of the solution.
• Molarity is mathematically defined as:
  $\mathrm{Molarity}=\frac{\mathrm{Number}\mathrm{of}\mathrm{moles}\mathrm{of}\mathrm{solute}}{\mathrm{Volume}\mathrm{of}\mathrm{solution}\mathrm{in}\mathrm{litre}}$
• As the number of moles of solute is measured in mol and the volume of solution will be in litre$\left(\mathrm{L}\right)$. So, the unit of molarity is $\mathrm{mol}{\mathrm{L}}^{-1}$.
• The unit of molarity is also represented by $\text{'}\mathrm{M}\text{'}$.

Hence, the unit of molarity is $\mathbf{mol}\mathbf{}{\mathbf{L}}^{\mathbf{-}\mathbf{1}}$ or $\mathbf{M}$.