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Preparation of Buffer system

rovieno
in Homework Help

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(THEORY)

How do I go in calculating the amount of grams of NA2HPO AND NAH2PO4 will be required to prepare 250ml of 0.2mol SODIUM PHOSPHATE buffer of pH 6.4 assuming the pKa (I) is 2.12, pKa (II) is 6.8 and pKa (III) is 12.13 ?!

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