Question

Soda water is the water solution of:

• A. carbonic acid
• B. soda ash
• C. washing soda
• D. baking soda

Answer 1

The correct option is A carbonic acid

When $C{O}_2$ dissolve in $H_{2}O$, only some molecules react with $H_{2}O$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 carbonic acid.

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

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

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

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

Water solution of $H_{2}C{O}_3$ is soda water.