When of is added in of a buffer solution, pH of the solution decreases by . What is the buffer capac — Ionic Equilibrium Chemistry Question

💡 Solution & Explanation

Buffer capacity ($\beta$) is defined as the number of moles of strong acid or base added per litre of the buffer divided by the change in pH. Moles of HCl added per litre = $0.05\text{ mol} / 0.200\text{ L} = 0.25\text{ M}$. The change in pH ($\Delta\text{pH}$) is $0.05$. Therefore, $\beta = 0.25 / 0.05 = 5$. Therefore, correct answer is 5.