Question

Calculate the molar ration needed to prepare a CH3COOH buffer with a desired pH of 5. The pKa of the weak acid at 25C is 4.76

Answer 1

The Henderson-Hasselbalch equation is

pH = pKa + log (base)/(acid)
5 = 4.76 + log (acetate)/(acetic acid)
Solve for the ratio (acetate)/(acetic acid)