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0.12 M Ba(OH)2 0.32 M HClO4 0.45 M NH3 (weak base) 1.3 M KOH 6.1 M HNO2 (weak acid) Answers: 1) 13.38 2) 0.49 3) 11.45 (note: use Kb) 4) 14.11 5) 1.25 Mixed pH calculations 1) What is the concentration of hydronium and hydroxide in a solution with a pH of 3.87? HBr is a strong acid. 2) If a solution of LiOH has a pOH of 1.7, what is the concentration of hydrogen ions? LiOH is a strong base. 3) What the Ka of HI if it has an initial concentration of 0.8M and pH of 3.25? HI is a weak acid. Answers: 1) [H3O+] =0.00013 M or 1.3x10-­‐4 M [OH-­‐]=7.4x10-­‐11 M 2) [H+]= 5x10-­‐13 M 3) Ka= 4x10-­‐7 M