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Is water really a pure substance?
asked Jun 8 in Chemistry by askzimstudent (5,930 points)
If you are looking at water as the chemical compound then it's pure. But if it's raining water or even tap water then it is not pure as it has other compounds in it.
When speaking in terms of chemical compounds and purity, we don't mean clean. Pure means is it homogenous, not whether it contains other compunds from different sources.

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A pure substance is a material that is homogenous (with constant composition and constant properties).

Water is a pure substance.
Salt ( Sodium Chloride) is also a pure substance.
answered Jun 8 by mr-lee (7,940 points)
selected Jun 8 by askzimstudent
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