What is the pH value of normal precipitation?

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Normal precipitation typically has a pH value around 5.6. This slightly acidic nature is primarily due to the dissolution of carbon dioxide from the atmosphere in the rainwater, forming carbonic acid. While pure water has a neutral pH of 7.0, precipitation is not purely water. The interaction with atmospheric carbon dioxide and various other contaminants and gases results in the pH being lower than that of pure water. Rainwater is usually slightly acidic because of this process, leading to the typical value of around 5.6. This is crucial in understanding how precipitation can affect soil chemistry and ecosystems, as the acidity level can influence nutrient availability and biodiversity. The other pH values listed do not accurately reflect this typical characteristic of normal precipitation.

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