Question

When0.1 mole of an acid is added to 2 lit of a buffer solution , the pH of buffer decreases by 0.5. The buffer capacity of the solution is

Answer 1

Given,

Amount of acid added = 0.1 mole

The formula of buffer capacity for a solution is given by -

Buffer capacity, Ф = $\frac{Number of moles of acid or base added to 1 litre of the solution}{Change in pH}$

As per question, 2 litres of solution contains 0.1 mole of acid

                            ∴ 1 litre of solution contains 0.05 mole of the acid  

Thus,

Buffer capacity, Ф (of the given solution) = $\frac{0.05}{0.5}$

                                                                    = 0.1