Question

Carbon dioxide dissolves in water to form carbonic acid.

• A. True
• B. False

Answer 1

The correct option is A True

When $C{O}_2$ dissolves in $H_{2}O$, only some molecules react with $H_2)$ to form $H_{2}C{O}_3$. Most of it gets dissolved, $C{O}_2$ remains loosely hydrated. $H_{2}C{O}_3$ is a weak dibasic acid. It forms a series of two salts. $C{O}_2$ is an hydride of carboniuc acid.

$C{O}_2\left(ag\right)\rightleftharpoons H_{2}C{O}_3\left(ag\right)$

$H_{2}C{O}_3^{-}\left(ag\right)\rightleftharpoons$ $H^{+}\left(ag\right)+C{O}_3^{-}\left(ag\right)$

This equilibrium is a upper system to maintain ${}_{p}H$ of human blood between $7.26-7.42$.

Water solution of $H_{2}C{O}_3$ (carbonic acid) is Soda water.