Deprotonation

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Ryan Chang 1C
Posts: 105
Joined: Sat Aug 24, 2019 12:17 am

Deprotonation

Postby Ryan Chang 1C » Mon Jan 20, 2020 9:01 pm

Why do we typically disregard the second deprotonation of polyprotic acids?

EvanWang
Posts: 101
Joined: Sat Sep 07, 2019 12:16 am

Re: Deprotonation

Postby EvanWang » Mon Jan 20, 2020 9:15 pm

Typically the Ka for the second deprotonation is extremely small. Apart from sulfuric acid, for most acids it doesn't have a meaningful effect on pH.

Aarushi Solanki 4F
Posts: 107
Joined: Sat Jul 20, 2019 12:17 am

Re: Deprotonation

Postby Aarushi Solanki 4F » Mon Jan 20, 2020 9:34 pm

Because the Ka for the second deprotonation is very small, it doesn't have a substantial effect on pH.

Hannah Romeo 1J
Posts: 58
Joined: Thu Jul 11, 2019 12:16 am

Re: Deprotonation

Postby Hannah Romeo 1J » Mon Jan 20, 2020 10:01 pm

For polyphonic acids, only the first Ka is significant as the removal of the first hydrogen results in the biggest change in pH. Each succeeding removal of hydrogen does not have as much effect on the pH.


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