All rain is normally slightly acidic, but truly acidic rains are rare and generally harmless. This was told socialbites.ca by a candidate of chemical sciences, a former employee of the Department of Meteorology and Climatology of the Faculty of Geography of Moscow State University. Lomonosov Irina Eremina, who has been analyzing the composition of Moscow rains for 40 years.
pH is used to measure acidity. It can take values from 1 to 14, the number 7 is in the middle. Less than seven is considered acidic and more is considered alkaline, Eremina explained.
“The pH of tap water is close to neutral. As for the atmosphere, rains, snowfalls, rain collected in the cleanest area, away from all sources of pollution, highways, will never be 7, close to 5.6 because there is carbon dioxide in the atmosphere and then it dissolves in moisture droplets to weak carbonic acid occurs, ”said Eremin socialbites.ca.
Considering that pure rainwater has a slightly acidic reaction, meteorologists agreed to consider rains with a pH between 5.0 and 7.0 neutral. Acid rain is considered to be those with a pH less than 5.0. They are quite rare: they fall no more than five times a year. In general, acid rains are harmless, you should not be afraid of them.
“If you measure the acidity of juice or wine, its pH will be lower than that of rain. The pH of wine is about 3.5. But if you pour wine on your head, no one will go bald. Also, acid rain doesn’t fall very often,” Eremina said.
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