P RACTICE E XERCISE #1 Calculate the pH of (a) a 1.0 x 10 -3 M HCl solution and (b) a 0.020 M Ba(OH) 2 solution. Predict the direction of the following.

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P RACTICE E XERCISE #1 Calculate the pH of (a) a 1.0 x M HCl solution and (b) a M Ba(OH) 2 solution. Predict the direction of the following reaction in aqueous solution: HNO 2 (aq) + CN - (aq) ⇄ HCN(aq) + NO 2 - (aq)

P RACTICE E XERCISE #2 Calculate the pH of a M nitrous acid (HNO 2 ) solution: HNO 2 (aq) ⇄ H + (aq) + NO 2 - (aq) The pH of a 0.10 M solution of formic acid (HCOOH) is What is the K a of the acid? 2

P RACTICE E XERCISE #3 Oxalic acid (H 2 C 2 O 4 ) is a poisonous substance used chiefly as a bleaching and cleansing agent (for example, to remove bathtub rings). Calculate the concentrations of all the species present at equilibrium in a 0.10 M solution. 3

P RACTICE E XERCISE #4 Calculate the pH of a 0.15 M solution of sodium acetate (CH 3 COONa). What is the percent hydrolysis? *Hydrolysis is a reaction involving the breaking of a bond in a molecule using water. 4

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