6C. 21

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Kelly Cai 4D
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Joined: Sat Jul 20, 2019 12:17 am

6C. 21

Postby Kelly Cai 4D » Sun Dec 01, 2019 9:18 pm

Suggest an explanation for the different strengths of (a) ace- tic acid and trichloroacetic acid; (b) acetic acid and formic acid.

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Joined: Thu Jul 11, 2019 12:15 am

Re: 6C. 21

Postby jeffreygong1I » Mon Dec 02, 2019 2:39 am

a.The Cl atoms in trichloroacetic acids pull electron density away from the O, making the O's hold on the H weaker and the acid therefore is stronger
b. Formic acid is stronger because the CH3 in acetic acid is an electron donating group that makes the H harder to remove.

christabellej 1F
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Joined: Sat Aug 17, 2019 12:17 am

Re: 6C. 21

Postby christabellej 1F » Mon Dec 02, 2019 6:57 am

For both, you would want to look at the difference in electronegativities. The one with a greater difference in electronegativity would make the O-H bond weaker by pulling electron density away, making the acid with the greater electronegativity difference stronger. For example, in the first one, the C-Cl bond has greater electronegativity than the C-H bond. So, trichloroacetic acid is stronger.

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