pH of acid rain is sometimes as low as 2. Explain. - Vidyadip

Question

pH of acid rain is sometimes as low as $2$. Explain.

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Answer

Normal rain is only slightly acidic having a pH of about $5.6.$
This is because carbon dioxide reacts with it to form weak carbonic acid.
$CO_2+ H_2O → H_2CO_3$
pH of acid rain usually ranges between $5.6$ and $3.5$; at times, it can be as low as $2.$

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