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When atmospheric carbon dioxide dissolves in raindrops, which weak acid is formed?

Answer and explanation

Correct answer: Carbonic acid

Correct answer: B, carbonic acid. Carbon dioxide dissolves in water and establishes an equilibrium in which some dissolved CO2 reacts with water: CO2 + H2O ⇌ H2CO3. Carbonic acid is weak and can partly release hydrogen ions, so natural rainwater containing atmospheric CO2 is mildly acidic rather than perfectly neutral. This process is part of the interaction between the water and carbon cycles and also helps weather some rocks over long periods. A and C can be associated with polluted air containing sulfur or nitrogen oxides, but they are not the ordinary product of CO2 dissolving in clean rain. D is formed from acetic acid sources such as vinegar or biological organic matter, not simply from atmospheric CO2. Memory cue: CO2 plus water gives carbonic acid; the formula to remember is H2CO3.

Related tags

Carbonic AcidRainwaterCarbon CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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