Weak Acids

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Janice Park 1E
Posts: 20
Joined: Thu Sep 27, 2018 11:22 pm

Weak Acids

Postby Janice Park 1E » Fri Jan 18, 2019 2:53 am

Can someone explain again why weak acids can have a pH of greater than 7 when they are technically still acids? I don't quite understand.

Elizabeth Gallmeister 1A
Posts: 29
Joined: Thu Sep 27, 2018 11:21 pm

Re: Weak Acids

Postby Elizabeth Gallmeister 1A » Fri Jan 18, 2019 8:27 am

If an acid produces a negligible concentration of H3O+, less than 10^-7 M, then taking the negative log will result in a number greater than 7. However, since the autoprotolysis of water produces 10^-7 M H3O+, we can just consider the solution to be neutral, with pH 7. Even though there is a weak acid, the H3O+ produced is so small that it doesn't have a bearing on the pH.

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