pH and pKa

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Patricia Chan 1C
Posts: 50
Joined: Sat Jul 20, 2019 12:16 am

pH and pKa

Postby Patricia Chan 1C » Mon Dec 02, 2019 8:20 pm

In lecture today, Lavelle went over an example question where he asked whether the acid was neutral or negatively charged at pH=6 based on the pKa value of the acid. Could someone explain why exactly it would be negatively charged? Thank you!

Nawal Dandachi 1G
Posts: 102
Joined: Sat Sep 28, 2019 12:16 am

Re: pH and pKa

Postby Nawal Dandachi 1G » Mon Dec 02, 2019 8:37 pm

AH <--> A- + H+
since the pH>pKa, the solution is more alkaline, and the acid will give off H+ to form A-. Therefore, it is negatively charged.

Alex Tchekanov Dis 2k
Posts: 118
Joined: Sat Aug 24, 2019 12:16 am

Re: pH and pKa

Postby Alex Tchekanov Dis 2k » Mon Dec 02, 2019 8:38 pm

When he said negatively charged, he basically meant that the acid was dissociated. This is because for example when HCl dissociates, the Cl is negative

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