13. 10 cm of an HCl solution with a pH of 2 was mixed 90 cm of water. What will be the pH of the resulting solution? a) 1 b) 3 c) 5 d) 7 14. Which of the following is the weakest acid in aqueous solution? a) CH OH K = 1.3 x 10-10 b) HCN K, = 4.9 x 10-10 c) H Se K = 1.5 x 104 d) K = 6.9 x 10 HF 15. In the acetic acid/acetate ion buffer system (HC2H2O2(wa)/C,H,O(aq)), what happens when a small amount of strong acid is added? a) The Hions combine with the acetic acid molecules and the pH decreases drastically. The H* ions combine with the acetate ions and the pH decreases drastically. c) The H" ions combine with the acetic acid molecules and the pH decreases only slightly. The H* ions combine with the acetate ions and the pH decreases only slightly. 16. Which salt will produce the most alkaline solution when dissolved in water? a) KNO: b) MgCl2 c) CHCOONa d) (NH4)2SO4