When of are added to a litre of a buffer solution, its pH changes from to . What is its exact buffer — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

Buffer capacity ($\beta$) is defined as the number of moles of acid or base added per liter of the buffer divided by the change in pH. $\beta = \frac{\Delta n}{\Delta pH} = \frac{0.02}{5.80 - 5.75} = \frac{0.02}{0.05} = 0.4$.