How much water should be added to a 36ml of 20% alchohol solution to reduce the concentration to 18%?

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01-07-2018
Chemistry

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How much water should be added to a 36ml of 20% alchohol solution to reduce the concentration to 18%?

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SvetkaChem SvetkaChem · Answer 1 · 2018-07-01T09:05:56+02:00

SvetkaChem SvetkaChem

01-07-2018

n - ml of alcohol

n1(alcohol in 20%) = n1(alcohol in 18%)

0.20*36 ml = 0.18 *x ml

x= 0.20*36/0.18 = 20*36/18= 40 ml of 18% solution

We had 36 ml, we will get 40 ml,
so we need to add
40 ml - 36 ml = 4 ml of water.

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