Polyprotic Acids and Bases 12.81

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Semi Yoon
Posts: 60
Joined: Fri Sep 28, 2018 12:27 am

Polyprotic Acids and Bases 12.81

Postby Semi Yoon » Sun Jan 20, 2019 10:21 pm

What is the pH of each of the following diprotic acid solutions at 25 C: (a) 0.010 M H2CO3(aq);
(b) 0.10 M (COOH)2(aq); (c) 0.20 M H2S(aq)?

Mindy Kim 4C
Posts: 65
Joined: Fri Sep 28, 2018 12:25 am

Re: Polyprotic Acids and Bases 12.81

Postby Mindy Kim 4C » Mon Jan 21, 2019 4:54 pm

For these polyprotic acids, you can solve them as you would a monoprotic acid because the Ka2 value of these acids is considered so small to the extent that the second reaction contributes insignificantly to the pH. However, for H2SO4, you would take into account both the first and second reactions as H2SO4 completely dissociates into H+ and HSO4-.


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