Using eq. 7: calculate the buffer capacity (BC) of your buffer solution before and after dilution with water, and enter the values obtained below. Remember that before dilution the water volume in the flask was 25 mL. After dilution, the volume was 35 mL. The number of moles of weak acid and conjugate base will depend on the amounts added to the flask. You're weak acids molar mass is 234 and that of the conjugate base is 256.