Question

among CH3COOH,CF3COOH and HCOOH , which is a stronger acid and why

Answer 1

Both HCOOH and CH3COOH are weak acids. CH3COOH is a slightly weaker acid than HCOOH.

Answer 2

$CF_3COOH$ is the stronger acid

Explanation:

The acidic strength depends on the stability of the resulting carboxylate ion.

The presence of electron withdrawing groups which withdraws the electrons from negatively charged oxygen of carboxylate results in more stability and hence make the acid more acidic. The presence of electron donating groups enhance the negative charge on carboxylate ion and thus decrease the stability of acids and thus make the acid less acidic.

$RCOOH\rightarrow RCOO^-+H^+$

Thus the order is : $CH_3COOH$ < $HCOOH$ < $CF_3COOH$ as $CH_3$ is electron donating and F is electron withdrawing in nature.

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