Question

The pH of a 25.0 mL sample of a buffer changed by one unit when 4.19 mL of 0.24 M HCl was added to it. What is the acid buffer capacity of this buffer?

Answer 1

The buffer capacity = mols acid/base needed to change the pH of a L of the buffer by 1 unit.
molos added = 0.00419L x 0.24M = ?
Then ?/25 mL x (1000/25) = mols to change 1L by 1 units = ?

You can put this into equatio form with mL as mLacid x Macid/mL buffer = 4.19 x 0.24/25.00 = 0.0402