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Calculating Ka for formic acid

Can someone please walk me through how to do the following problem? Thank you!

For a 0.13 M solution of formic acid, HCOOH, the pH = 2.40. Calculate Ka for formic acid.

HCOOH <---> HCOO- (aq) + H+ (aq)

Solution Summary

This solution explains the steps in calculating Ka for formic acid.

$2.19