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First we write the equation for Ka: Ka = [H+] [A-] / [HA]We then use the given pH of 5 to calculation the H+ concentration in the solution: 10^{-5 }= 0.00001 mol/dm3We then rearrange the Ka expression, to find [A-] / [HA], which is the same as the proportions of salt to acid.The full calculation is completed on the whiteboard.The final answer is 1.74.