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1a) Calculate the relative amounts (in mL) of H2PO4- and HPO42- that should be combined to...

1a) Calculate the relative amounts (in mL) of H2PO4- and HPO42- that should be combined to produce a phosphate buffer at pH 7.0 (pka 6.86). Concentrations of H2PO4- and HPO42- are both 0.1M, desired final volume is 200 mL

1b) Actual pH achieved upon mixing in this ratio:

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