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I am wondering how different the O-C-O angle is in a carboxylate vs its acid form.

Does it (noticeably) increase because of the electron-electron repulsion caused by an additional lone pair?

Bond lengths are given here, but angles are mentioned only when discussing neutral acid (giving 122°).

kvanderfluegh
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    Not a proper answer, but the O-C-O bond angle in a given carboxylate depends also on their counterion. In aqueous solution you may have the free carboxylate or some form of a metal carboxylate complex. In the solid dry state of a metal carboxylate, it will be different than in solution. I also would assume that the O-C-O bond angle in dissolved, neutral carboxylic acids depends on the solvent as well as their concentration, as they tend to form dimers. Could you specify a little more what exactly you are interested in? – Snijderfrey Apr 22 '22 at 19:12
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    This answer might help you: https://chemistry.stackexchange.com/a/60645/17368 – Nilay Ghosh Apr 23 '22 at 06:07

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