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Practice Exercise #1

Practice Exercise #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 reaction in aqueous solution: HNO 2 ( aq ) + CN - ( aq ) ⇄ HCN( aq ) + NO 2 - ( aq ). Practice Exercise #2.

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Practice Exercise #1

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  1. Practice Exercise #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 reaction in aqueous solution: HNO2(aq) + CN-(aq) ⇄ HCN(aq) + NO2-(aq)

  2. Practice Exercise #2 • Calculate the pH of a 0.036 M nitrous acid (HNO2) solution: HNO2(aq) ⇄ H+(aq) + NO2-(aq) • The pH of a 0.10 M solution of formic acid (HCOOH) is 2.39. What is the Ka of the acid?

  3. Practice Exercise #3 • Oxalic acid (H2C2O4) 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.

  4. Practice Exercise #4 • Calculate the pH of a 0.15 M solution of sodium acetate (CH3COONa). What is the percent hydrolysis? *Hydrolysis is a reaction involving the breaking of a bond in a molecule using water.

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