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How many grams of potassium dihydrogen phosphate (MW=136.09 g/mol) and dipotassium hydrogen phosphate (MW=174.18 g/mol) would...

How many grams of potassium dihydrogen phosphate (MW=136.09 g/mol) and dipotassium hydrogen phosphate (MW=174.18 g/mol) would be needed to produce a 2 L buffer solution of pH 6.8 at 100 mM solute concentration? The pKa’s for phosphoric acid, a triprotic acid, are 2.15, 6.82 and 12.38.

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