Answer to Question #180919 in General Chemistry for Chaihcai

General Chemistry

Question #180919

Buffer solutions:

1. Calculate the pH of a carbonate buffer system that contains 0.0065 M HCO₃^-and 0.0084 M CO₃^2-. The K_a of HCO^3- is 4.7 X 10^-11.

Expert's answer

PH=pKa+log(salt/acid)(pKa=-log(ka)]

pH= 10.32+log(0.0084/0.0065)

pH=10.32+0.11

pH= 10.43

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