Question

how will u prepare 70% alcohol a solution by using 95% and 20% alcohol ?
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Answer 1

Answer:

For example, to make 70% ethanol from 95%ethanol, take 70 mL of 95% ethanol and add enough water to bring the volume to 95 mL. You will then have 95 mL of 70% ethanol.

Answer 2

70% of 200 ml is 140 ml, so you would need 140ml of pure ethanol.

But you have 95% ethanol, so you would need a little more of that concentrated solution to make the dilute solution.

The answer could be 147.4 ml. However, that answer might be wrong for a number of reasons. Is this a weight or volume percentage?

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