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Phosphoric acid is a triprotic acid (Ka1=6.9103,Ka2=6.2108, and Ka3=4.81013). To find the pH of a buffer composed of H2PO4(aq) and HPO42(aq), which pKa value should

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Phosphoric acid is a triprotic acid (Ka1=6.9103,Ka2=6.2108, and Ka3=4.81013). To find the pH of a buffer composed of H2PO4(aq) and HPO42(aq), which pKa value should be used in the Henderson-Hasselbalch equation? pKa1=2.16pKa2=7.21pKa3=12.32 Calculate the pH of a buffer solution obtained by dissolving 27.0g of KH2PO4(s) and 38.0g of Na2HPO4(s) in water and then diluting to 1.00L. pH

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