A buffer contains 0.15 mol of propionic acid C2H5COOH and 0.13 mol of sodium propionate C_2 H_5 COONa in 1.20 L.
What is the pH of this buffer?
What is the pH of the buffer after the addition of 0.01 mol of NaOH?
What is the pH of the buffer after the addition of 0.01 mol of HI?