Equilibria (Kw/ka) a) Water molecules can ionise to a very small extent. i) Write an equation to show the reaction that

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Equilibria Kw Ka A Water Molecules Can Ionise To A Very Small Extent I Write An Equation To Show The Reaction That 1 (20.14 KiB) Viewed 29 times

Equilibria (Kw/ka) a) Water molecules can ionise to a very small extent. i) Write an equation to show the reaction that occurs with the self-ionisation of water. (1 mark) ii) Write the expression for the equilibrium constant, Kw, for the reaction and state its units. (2 marks) b) The value of the acid dissociation constant, ka, for ethanoic acid, CH3COOH, is 1.74 x 10-5 mol dm 3 at 298 K. i) Write an expression for Ka for ethanoic acid. (1 mark) ii) Calculate the pH at 298 K of a 0.220 mol dm-solution of ethanoic acid. Give your answer to 2 decimal places. (4 marks) a