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What colour will rainwater turn if you add universal indicator?
Updated: 4/28/2022
Wiki User
∙ 13y agoBest Answer
Unpoluted rain has a pH around 5.7 (very mild acid) but with typical levels of atmospheric polution in the US its pH is typically between 5.6 to 3.8 (mild acid) and exceptionally it can have a pH as low as 2 (fairly strong acidic) due to atmospheric polution such as Sulpher Dioxide which is disolved in the rain.
Typically a universal indicator would show yellow for unpoluted rain, orange for mildly poluted rain and red for very poluted rain.
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