First slide

Buffer Capacity

Question

When 0.1 mole of an acid is added to 2 lit of a buffer solution, the pH of the buffer decreases by 0.5. The buffer capacity of the solution is

Easy

A

0.6
B

0.4
C

0.2
D

0.1

Solution

0.5 change in P^H occurs by adding 0.1 mole of an acid to 2 litre of buffer solution.
1 change in P^H occurs by adding 0.1 mole x 2 mole of an acid to 2 litre of buffer solution.
1 change in P^H occurs by adding $\frac{0.1 \times 2}{2}$ =0.1
mole of an acid to 1 litre of buffer solution.

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