Question from Monday's Lecture?

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Ayesha Aslam-Mir 3C
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Question from Monday's Lecture?

Postby Ayesha Aslam-Mir 3C » Tue Dec 08, 2020 1:56 am

Dr. Lavelle in the lecture said a solution is acidic if pH<pKa. Why is that?

Additionally, it was also mentioned that the organic acid HA in the example, when in acidic solution pH of 6, that the acid is protonated (with the H+). Why does this make the organic acid neutral?

Benjamin_Hugh_3F
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Re: Question from Monday's Lecture?

Postby Benjamin_Hugh_3F » Tue Dec 08, 2020 6:28 am

Looking at the PH equation will help you understand why pH<pKa means a solution is acidic.
pH=pKa+log([A−]/[HA])
If the pH is lowered so that it is lower than the pKa, then it means HA should be greater than A-, making the solution more acidic.


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