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a) Use the following equation to explain how the aqueous hydrogen carbonate ion acts as a buffer. HCO3 – (aq) + H2O (l) H3O + (aq) + CO3 2– (aq) (b) A buffer solution is made by adding 6.56 g of sodium ethanoate, CH3COONa, to 1 dm3 of 0.02 M ethanoic acid, CH3COOH. i. Calculate the concentration of the sodium ethanoate solution in mol dm-3 . ii. Ka for ethanoic acid is equal to 1.8 x 10-5 mol dm-3 . Write the expression for Ka and use it to calculate the pH of the buffer solution. State any assumptions made in the calculation.
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