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en.wikipedia.org/wiki/Acid_rain

"Acid rain" is a popular term referring to the deposition of a mixture from wet (rain, snow, sleet, fog, cloudwater, and dew) and dry (acidifying particles and gases) acidic components. Distilled water, once carbon dioxide is removed, has a neutral pH of 7. Liquids with a pH less than 7 are acidic, and those with a pH greater ...

www.chemistry.wustl.edu/~edudev/LabTutorials/Water/FreshWater/acidrain.html

As is seen in Table I, carbon dioxide (CO2) is present in the greatest concentration and therefore contributes the most to the natural acidity of rainwater. .... Acid rain triggers a number of inorganic and biochemical reactions with deleterious environmental effects, making this a growing environmental problem worldwide.

www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_pre_2011/context_chemistry/acidrainrev1.shtml

Limestone is made of calcium carbonate, which reacts with acids. calcium carbonate + acid non-reversable equation (equals) calcium salt + water + carbon dioxide. During the last century the rain water in some parts of the world has become far more acidic. This acid rain has been caused by the emission of pollutant gases ...

sciencing.com/rain-naturally-acidic-6475032.html

Apr 24, 2017 ... One of these impurities is atmospheric carbon dioxide, or CO2, which is a weak acid. It is possible for rain to combine with other substances in the atmosphere that will increase the alkalinity of its pH, such as suspended soil dust, but most rain water ultimately has a pH between five and seven, making it ...

www.epa.gov/acidrain/what-acid-rain

Mar 1, 2017 ... Acid rain results when sulfur dioxide (SO2) and nitrogen oxides (NOX) are emitted into the atmosphere and transported by wind and air currents. ... Winds can blow SO2 and NOX over long distances and across borders making acid rain a problem for everyone and not just those who live close to these ...

www.middleschoolchemistry.com/lessonplans/chapter6/lesson10

Key Concepts. Carbon dioxide (CO2) gas dissolved in water can cause water to become acidic. The acidity of water from dissolved CO2 can be reduced by a base such as baking soda (sodium bicarbonate). Summary. The teacher blows into a universal indicator solution until it changes color. Students interpret this color ...

earthscience.stackexchange.com/questions/7929/what-would-the-ph-of-rainwater-be-if-carbon-dioxide-in-the-atmosphere-doubled

Apr 30, 2016 ... "Cutting the CO2 in half would yield about 5.9." (A valid approach because we expect reversibility in chemistry and physics.) [pH of 5.9 for 200 ppm CO2]. Atmospheric CO2 of 200 would be about that of the last glacial maximum. So most of the difference between pure water at pH 7 and 5.9 would seem to ...

chemistry.stackexchange.com/questions/71592/difference-in-ph-of-water-and-rainwater

Mar 30, 2017 ... Water requires a non-gaseous surface to make the transition from a vapor to a liquid; this process is called condensation. In the atmosphere, this surface ... in a cloud droplet. It is this absorption of naturally occurring, acidic carbon dioxide that is the primary reason that essentially all rain is somewhat acidic.

www.quora.com/Doesnt-CO2-contribute-to-acid-rain

Carbon dioxide in the air can dissolve in rain water to form carbonic acid, H2CO3 . Carbonic acid is a weak acid. It partially ionises to form hydrogen ions. The hydrogen ions from carbonic acid give natural rain water a slightly acid pH value of 5.6. For this reason, technically, all rain is acid rain. Even under unpolluted ...