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Phosphoric acid is a triprotic acid (Ka1=6.9×10−3Ka1=6.9×10−3, Ka2=6.2×10−8Ka2=6.2×10−8, and Ka3=4.8×10−13Ka3=4.8×10−13). To find the pH of a buffer...

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Chemistry

Phosphoric acid is a triprotic acid (Ka1=6.9×10−3Ka1=6.9×10−3,Ka2=6.2×10−8Ka2=6.2×10−8, and Ka3=4.8×10−13Ka3=4.8×10−13).

To find the pH of a buffer composed of H2PO−4(aq)H2PO4−(aq) andHPO2−4(aq)HPO42−(aq), which pKaKa value should be used intheHenderson–Hasselbalch equation?

pKa1Ka1 = 2.16

pKa2Ka2 = 7.21

pKa3Ka3 = 12.32

Calculate the pH of a buffer solution obtained by dissolving18.018.0 g of KH2PO4(s)KH2PO4(s) and 30.030.0 g ofNa2HPO4(s)Na2HPO4(s) in water and then diluting to 1.00 L.

pH=

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