Suppose you have an aqueous solution prepared by dissolving 0.050 mol of NaH2PO4 in 1 L of water. This solution is not a buffer, but suppose you want to make it into one. How many moles of solid Na2HPO4 must you add to this aqueous solution to make it into:
(a) A buffer of pH 7.21
(b) A buffer of pH 6.21
(c) A buffer of pH 8.21
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