Question

a person preparing a medicine wants to convert 15% alcohol solution to32% alchohal solution .find how much pure alchohal should he mix with 400 ml of 15% alchohol solution to obtain it.

Answer 1

in 400 ml of alcoholic solution, percent of alcohol is 15%

so, volume of alcohol= 15% of 400 ml

                                 =60 ml

now, 15% is 60 ml, so 1% = 60/15= 4 ml

so , 32 % = 32×4 = 128 ml

volume added= 128 - 60 = 68 ml