11. What is the conjugate base of HSO4 (a? A. H:0 (4) B. OH (24) C. H2SO4(24) D. SO. 4) E. This compound does not have a conjugate base. 12. What is the concentration of hydroxide ions in a solution of 0.350 mol/L Hlaq? A. 0.350 mol/L B. 0.175 mol/L C. 2.86 x 10-14 mol/L D. 0.650 mol/L E. 1.30 mol/L 13. A solution contains 3.25 x 10-8 hydroxide ions. What is the pH of the solution? A. 3.25 B. 6.51 C. 7.49 D. 8.00 E. none of the above 14. Identify the weakest acid. A. HCN K. = 6.2 x 10-10 B. HCOOH K. = 1.8 x 10+ C. HNO2 K= 7.2 x 10 D. HF Ka = 6.6 x 10-4 E. All acids are the same strength, as long as they have a dissociable hydrogen ion. 15. The equilibrium system shown below was analyzed and the concentrations of HI(g), H2(g), and 13(g) were found, in mol/L, to be 4.4, 3.2, 1.5 respectively. The equilibrium constant must be which of the following? H2(g) +1:(g) =====> 2HI(g) + 65 kJ A. 4.0 D. 1.1 B. 0.25 E. 0.16 C. 0.92 24. A solution is made up of 50 mL of 0.065 mol/L HCl(ag) and 65 mL of 0.050 mol/L NaOH ay). What is the pH of the resulting solution? A. 1.19 B. 1.30 C. 7.00 D. 12.81 E. 12.70