## Problem 12.53 Acetic Acid vs. Formic Acid

Acidity $K_{a}$
Basicity $K_{b}$
The Conjugate Seesaw $K_{a}\times K_{b}=K_{w}$

Alex Nguyen 3I
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Joined: Fri Sep 25, 2015 3:00 am

### Problem 12.53 Acetic Acid vs. Formic Acid

Can anyone explain why formic acid is stronger than acetic acid? I don't fully understand what the solution means when it states that the CH3 group in acetic acid has electron-donating properties.

Chem_Mod
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### Re: Problem 12.53 Acetic Acid vs. Formic Acid

The difference between acetic acid and formic acid is that acetic acid has a CH3 group where formic acid only has an H. CH3 is an electron donating group because there is high electron density around the C due to the 3 attached H's. The C that's attached to both O's will be slightly positive because O is more electronegative. Therefore the electron donating properties of the CH3 group help to stabilize that C.