Question

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

(a) 0.2

(b) 0.5

(c) 0.15

(d) 0.3

I got this question during an online exam.

My question is from Equilibrium in chapter Equilibrium of Chemistry – Class 11

Answer 1

Correct option is (d) 0.3

For explanation: Buffer capacity is defined as the number of moles of acid or base added in one litre of the solution to change the pH by Unity. Therefore here buffer capacity = 3/5 divided by 2 = 0.6/2 = 0.3. The buffer capacity is given as 0.3.