A chemist needs a 70% solution of tannic acid. How much distilled water must he add to 5 gallons of a 90% solution of acid to obtain the 70% solution?

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asked Nov 26, 2018 126k views

1 vote

A chemist needs a 70% solution of tannic acid. How much distilled water must he add to 5 gallons of a 90% solution of acid to obtain the 70% solution?

Mathematics
middle-school

Unwind asked

by Unwind

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1 Answer

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4.5 + 0 = 3.5 + 0.7x
1 = 0.7x
x = 1/0.7
x = 1.43 gallons of distilled water
Hope this helps!!

Soamazing answered Dec 2, 2018

by Soamazing

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