How many grams of the conjugate acid phosphate salt would you need to prepare 100 mL of a 0.10 M phosphate buffer of pH 6.8. Use the below data in your calculations. Give the answer in grams rounded to nearest 3rd decimal point. Give just the number without units. • pKa of KH2PO4/K2HPO4: 7.21 Molecular weight of KH2PO4: 136.1 g/mol • Molecular weight of K2HPO4: 174.2 g/mol • Henderson-Hasselbach equation: [A-] pH = pK + log| a [HA]

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