# In the reaction CH_3COOH + H_2O rightleftharpoons CH_3COO^(-) + H_2O, what is a conjugate acid-base pair?

Apr 24, 2018

$C {H}_{3} C O O H$ and $C {H}_{3} C O {O}^{-}$
${H}_{2} O$ and ${H}_{3} {O}^{+}$

#### Explanation:

So

the $C {H}_{3} C O O H$ is a acid

the $C {H}_{3} C O O H$ lost the hydrogen on the end so its the acid by the Bronsted Lowry Definition of acids

the $C {H}_{3} C O {O}^{-}$ is the conjugate base as in the reverse reaction, it would have to pick up ${H}^{+}$ to form acetic acid again

The ${H}_{2} O$ is an base (on the left), as it accepts the hydrogen ion that the acetic acid lost
(on the right side, it should be a ${H}_{3} {O}^{+}$ instead)
The ${H}_{3} {O}^{+}$ is a conjugate acid, as it would have to lose the ${H}^{+}$ to revert to ${H}_{2} O$

:)