Question

In the following reaction:
$HC{O}_3^{-}+H_{2}O\rightleftharpoons {CO}_3^{2-}+H_3{O}^{+}$
which two substances are Bronsted bases?

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

Answer 1

The correct option is D ${CO}_3^{2-}$ and $H_{2}O$

Any substance that can accept $H^{+}$ is called bronsted base.

$C{O}_3^{2-}$ can accept $H^{+}$ ion and it can become $HC{O}_3^{-}$.$H_{2}O$ can also accept $H^{+}$ ion and it can become $H_3{O}^{+}$. So $C{O}_3^{2-}$ and $H_{2}O$ are bronsted bases.