Question

what what volume of Ethyl alcohol and Water must be mixed together to prepare 250 ml 60 percentage by volume of alcohol in water

Answer 1

60% by volume of alcohol solution means,each 100 ml of solution will have 60 ml ethyl alcohol. hence in a250ml solution of 60% by volume of alchohol and water,alcohol should be 150 ml and water should be 100ml.

Answer 2

60% v/v means 60 ml ethanol in 100 ml of solution. Water is 100-60 = 40 ml.

Ethanol to Water ratio is 60/40 = 3/2

Hence in 250 ml solution, 3 parts of 250ml is ethanol and 2 parts of 250ml is water.

In total, 5 parts makes 250. So 1 part is 250/2 = 50 ml.

Hence ethanol needed is 150ml and water 100ml