• In the Ethanol,water mixture the ratio of Ethanol and water is 80:20= 4:1 .

• The volume of water is 250 ml, then the volume of Ethanol would be 4 times the volume of water= 250 x 4= 1000ml = 1 Litre.

• So 1000 ml. of Ethanol should be added to 250 ml.of water to make it a 80% v/ v mixture.

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