What is the pH change of a 0.240 M solution of citric acid (pKa=4.77) if citrate is added to a concentration of 0.160 M with no change in volume?
Since -
pH = pKa + log [Citrate / citric acid]
= 4.77 + log (0.160/0.240)
= 4.59
Initail pH = -log (Ka*[H+])1/2 = (10-4.77*0.240)0.5 = -log (0.0020) = 2.7
pH change = 4.6-2.7 = 1.9
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