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10 Nov 2019
Which of the following triprotic acid's pKas would you be able to determine via titration as you did with phosphoric acid? Briefly explain your choice(s). It may help you to know that the pH at the equivalence point can be calculated by averaging the pKas on either side. Citric acid: Ka1= 7.1 x 10^-4 Ka2 = 1.7 x 10^-5 Ka3 = 4.1 x 10^-7 Arsenic acid: Ka1= 5.62 x 10^-3 Ka2 = 1.70 x 10^-7 Ka3 = 3.95 x 10^-12 Boric acid: Ka1 = 7.3x 10^-10 Ka2 = 1.8 x 10^-13 Ka3=1.6x 10^-14
Which of the following triprotic acid's pKas would you be able to determine via titration as you did with phosphoric acid? Briefly explain your choice(s). It may help you to know that the pH at the equivalence point can be calculated by averaging the pKas on either side. Citric acid: Ka1= 7.1 x 10^-4 Ka2 = 1.7 x 10^-5 Ka3 = 4.1 x 10^-7 Arsenic acid: Ka1= 5.62 x 10^-3 Ka2 = 1.70 x 10^-7 Ka3 = 3.95 x 10^-12 Boric acid: Ka1 = 7.3x 10^-10 Ka2 = 1.8 x 10^-13 Ka3=1.6x 10^-14