Question

In the reaction, ${HC{O}_3}^{-}+H_{2}O\to O{H}^{-}+H_{2}C{O}_3$, the conjugate acid - base pair is:

• A. $H_{2}C{O}_3,HC{O}_3^{-}$
• B. $H_{2}O,H_3{O}^{+}$
• C. $O{H}^{-},H_3{O}^{+}$
• D. $H_{2}C{O}_3,C{O}_3^{2-}$

Answer 1

The correct option is A $H_{2}C{O}_3,HC{O}_3^{-}$

Species formed after protonating from an acid are called conjugate bases.
Species formed after accepting $H^{+}$ into a base are called conjugate acids.

$HC{O}_3^{-}+H^{+}\to H_{2}C{O}_3$
Base Conjugate acid