How much water should be mixed with 12 ml of alcohol so as to obtain 12% alcohol solution?
Let the volume of water to be mixed be x ml
Total volume of the mixture = (x+12) ml
If this is to be a 12% alcohol solution, that means that the mixture contains 12% of alcohol by volume.
We know that the mixture has 12 ml of alcohol.
So, we get the equation - 12/(x+12) = 12% or 12/100
x = 88 ml
So w need to add 88 ml of water to make it a 12% alcohol solution