Acid rain has a pH of approximately 4.3 because of the elements present. The precipitation in the given forest is becoming more acidic since the pH is 4.0.
A pH scale is used to assess acidity and alkalinity, with 7.0 representing neutrality. A substance's pH scales from 0 to 14, with 0 being the most acidic and greater than 7 being alkaline. A regular rain has a pH of around 5.6, making it mildly acidic due to the dissolution of carbon dioxide (CO2) into water to create weak carbonic acid. The pH of acid rain typically ranges from 4.2 to 4.4.
Any type of precipitation that contains acidic elements, such as sulfuric or nitric acid, that falls to the ground in wet or dry forms from the atmosphere is referred to as acid rain, also known as acid deposition. This can apply to rain, snow, fog, hail, and even corrosive dust.
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