Question

Why do we need pure substance

Answer 1

hey here is ur answer.
Purity can also have an important impact on the chemical properties of asubstance. Pure substances have the potential to form predictable products from chemical reactions. ... Therefore, chemists often use substances of high purity when conducting chemical research.
I hope it's help for u ..

Answer 2

Hey mate.....^_^

Here's ur ans.

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We need pure substance to continue any reaction .

Pure substance has it's own importance , we can't always use impure substances but mainly we get impure substances .

That's all depends on the usage of that substance.