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If a buffer were needed with a pH of 7.0, what would be the best combination...

If a buffer were needed with a pH of 7.0, what would be the best combination of weak acid and conjugate base to formulate the buffer? (please explain why you chose your answer)

A) H3PO4 and H2PO4-

B) H2PO4- and HPO42-

C) HPO42- and PO43-

D) acetic acid and acetate

E) lactic acid and lactate

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Answer #1

Answer:-

The correct answer is given as follows,

B) H2PO4- and HPO42-

because pKa2 for phosphoric acid is 7.20 and the required pH is 7.0 so there will be minimum difference between pKa and pH.

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