Uncontaminated rain water has a pH of 5.6 (slightly acidic) because

A. oxides of sulfur are always present in the atmosphere, even from natural sources.
B. upon condensation, water chemically reacts with carbon dioxide forming a weak carbonic acid.
C. most water vapor originates by evaporation from the oceans and sea water is acidic.
D. droplets of water necessarily condense on atmospheric particulate.


Answer: B

Environmental & Atmospheric Sciences

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