What is the buffer capacity if 3 moles are added in 5 litres of the solution to change the pH by 2 units?

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A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an acid or a base aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small amount of strong acid or base is added to it.


What is the buffer capacity if 3 moles are added in 5 litres of the solution to change the pH by 2 units?