The normal rain water is slightly acidic and its $\mathrm{pH}$ value is $5.6$ because of which one of the following?
Solution
Normally rain water has a pH of 5.6 due to
presence of H<sup>+</sup> ions formed by the reaction of rain
water with carbon dioxide present in the
atmosphere.
<br/><br/>$$
\begin{aligned}
& \mathrm{H}_2 \mathrm{O}(\mathrm{l})+\mathrm{CO}_2(\mathrm{~g}) \leftrightharpoons \mathrm{H}_2 \mathrm{CO}_3(\mathrm{aq}) \\\\
& \mathrm{H}_2 \mathrm{CO}_3(\mathrm{aq}) \leftrightharpoons \mathrm{H}^{+}(\mathrm{aq})+\mathrm{HCO}_3^{-}(\mathrm{aq})
\end{aligned}
$$
About this question
Subject: Chemistry · Chapter: p-Block Elements · Topic: Group 13: Boron Family
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