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The pH of a solution by mixing 100 ml of 0.2M CH3COOH with 100 ml of 0.2M NaOH. pKa for CH3COOH = 4.74

The pH of a solution by mixing 100 ml of 0.2M CH3COOH with 100 ml of 0.2M NaOH. pKa for CH3COOH = 4.74

Grade:11

1 Answers

Pooja
17 Points
7 years ago
Moles of NaOH added to the mixture = 0.1 X 0.2 = 0.02 molesCH3COOH is a weak acid and does not completely dissociate in aqueous solution.Ionization reaction CH3COOH + H2O ----> CH3COO- + H3+OAcid dissociation constant, Ka = [CH3COO-] [H3+O] / [CH3COOH] (1)The initial and equilibrium constant for the reactants and products is CH3COOH CH3COO- H3+OInitial 0.2M 0 0Assuming x moles are dissociated at equilibriumEquilibrium 0.2-x or 0.2 x xAs acetic acid is a weak acid with a degree of dissociation of less than 5%, value of x

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