Question

To make a solution of 12 percentage of alchohol and water we take 12ml of alchohol, how much water should be taken ?

Answer 1

Explanation:

Assuming that the percentage alcohol in the original solution is % by volume, 12ml of 12% alcohol solution contains 12 * 12 /100 = 1.44ml of pure alchohol.

If we let X = the final volume of the 6% v/v alcohol solution we wish to make then we can write the following equation

6 = 1.44/x * 100

Multiplying both sides of the equation by x we get;-

6x=100*1.44

x=144/6

x=24

Therefore if the final volume of the 6% solution is 24ml, we need to add;-

(24-12) = 12 ml of water.

Hope this helps you

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