Question

Dear sir,

Pls. help me with the below question.

20 cm^3 of alcohol is dissolved in 80 cm^3 of water. Calculate the % of alcohol in the solution.

Thank you

Answer 1

20% solution of ethanol by volume means that 100 cm3 of the solution contains 20 cm3 of ethanol and 80cm3 of water.
It can be represented as % v/v or % volume and used to prepare such solutions in which both components are in liquids state. It is the number of parts of by volume of solute per hundred parts by volume of solution. Therefore,
Volume % = volume of solute/total volume of solution x 100%