(A) Pure water has a $pH$ of $7.0$ (neutral). Natural,unpolluted rainwater has a $pH$ of about $5.6$ due to the presence of dissolved $CO_{2}$. Acid r

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(A) Pure water has a $pH$ of $7.0$ (neutral). Natural,unpolluted rainwater has a $pH$ of about $5.6$ due to the presence of dissolved $CO_{2}$. Acid rain is defined as rainwater with a $pH$ value lower than $5.6$ due to the presence of pollutants like $SO_{2}$ and $NO_{x}$ which form acids in the atmosphere.