The pH of rain water, is approximately?

By BYJU'S Exam Prep

Updated on: September 25th, 2023

(A) 5.6

(B) 7.5

(C) 7.0

(D) 6.5

The pH of Rainwater is approximately 5.6. In clean air, the rainwater picks a few acidic oxides as SO2 and CO2 obtained from a volcanic eruption. These substances make the rain a little acidic, with a pH of 5.6 to 6.

Explain pH Scale

The hydrogen ion’s (H+) activity is measured by pH, according to its technical definition. It is essentially an acidity measurement. The pH scale has numbers 0 through 14. The neutral point on the scale is represented by the number 7. A substance’s pH rating determines whether it is considered acidic or basic. If the pH is below 7, it is classified as acidic, and if it is over 7, it is classified as basic.

The pH of typical rainwater is 5.6. (slightly acidic). This occurs as a result of its exposure to atmospheric carbon dioxide. Carbonic acid is created when carbon dioxide dissolves in rainwater.

pH Level of RainWater

A pH value of less than 5.6 is regarded as acid rain. Rainwater’s pH can alter from both natural and artificial sources of substances. When the pH of rainwater is around this level, it is safe to consume. Additionally, the pH of rainwater varies from location to location. This is brought on by areas with high pollution levels and others with pure air.

Rainfall is contaminated by atmospheric pollution to such an extent that it harms the ecosystem, especially lakes and forests. Burning coal and other fossil fuels for industrial purposes produce waste gases that are high in sulfur and nitrogen oxides, which react with atmospheric water to form acids. This is the primary cause of acid rain.


The pH of rainwater is approximately? (A) 5.6 (B) 7.5 (C) 7.0 (D) 6.5

Rainwater has a pH of roughly 5.6. With a pH of 5.6 to 6, these elements slightly acidify the rain. However, when raindrops fall over contaminated air, they ingest pollutants, including HCl mists, SOx, and NOx. They cause acid rain, which has a pH range of 3.5 to 5.6, to fall more frequently.

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