What volume of ethyle and alcohol must be mixed together to prepare 250ml of 60% by volume of alcohol in water?
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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
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