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Buffer exercise 1

100 cm³ of pH 7.0 buffer needs to be made from some 0.1 mol dm^-3 potassium dihydrogenphosphate (KH₂PO₄) solution and 0.1 M dipotassium hydrogenphosphate (K₂HPO₄) solution. The following equilibrium is set up:

and the K_a has a value of 1.39 × 10^-7 mol dm^-3. Calculate the appropriate volumes of the solutions which need to be used.

Answer