When of is added in of a buffer solution, pH of the solution decreases by . What is the buffer capacity of the solution?

Question

When $0.05	ext{ mole}$ of $	ext{HCl}$ is added in $200	ext{ ml}$ of a buffer solution, pH of the solution decreases by $0.05	ext{ unit}$. What is the buffer capacity of the solution?

Prashant Kotian · Accepted Answer

Correct answer: 5. Buffer capacity () 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 = . The change in pH () is . Therefore, . Therefore, correct answer is 5.

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