pH = pKa + log ( [A-] / [ HA ] 100 ml of buffer is made using 0.041 moles of HC2H3O2 (acetic acid) and 0.038 moles of NaC2H3O2 (sodium acetate). The Ka of acetic acid is 1.8 x 10-5 Using the above equation, what is the pH of this solution? What are spectator ions and what effect do they have on the pH of water