Propanoic acid, C₂H5COOH, is a weak acid, with Ka = 1.35 x 10-5 mol dm-³. i) Write an expression for the acid dissociation constant, Ka, of propanoic acid. ii) Calculate the hydrogen ion concentration and pH of a solution of propanoic acid containing 0.20 mol dm³. State what assumption is made in the calculation.

Chemistry: The Molecular Science
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Chapter14: Acids And Bases
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Propanoic acid, C₂H5COOH, is a weak acid, with Ka = 1.35 x 10-5 mol dm-³.
i) Write an expression for the acid dissociation constant, Ka, of propanoic acid.
ii) Calculate the hydrogen ion concentration and pH of a solution of propanoic
acid containing 0.20 mol dm-³. State what assumption is made in the
calculation.
Transcribed Image Text:Propanoic acid, C₂H5COOH, is a weak acid, with Ka = 1.35 x 10-5 mol dm-³. i) Write an expression for the acid dissociation constant, Ka, of propanoic acid. ii) Calculate the hydrogen ion concentration and pH of a solution of propanoic acid containing 0.20 mol dm-³. State what assumption is made in the calculation.
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