Question

How would you prepare 500ml of a 70% volume by volume as solution of ethyl alcohol?

Answer 1

Given - Total volume - 500 ml

Concentration - 70% v/v

Find - Volume of alcohol and volume of water for 500 ml alcohol solution.

Solution - 70% v/v solution means presence of 70 ml alcohol in 100 ml solution. Which in turn indicates presence of 30 ml water.

Now, to prepare 500 ml solution -

100 ml contains 70 ml alcohol

500 ml will contain - 70/100*500

Hence, 500 ml will contain - 350 ml ethyl alcohol.

Amount of water - 500-350

Amount of water - 150 ml.

Therefore, 70% volume by volume solution of ethyl alcohol of 500 ml will be made by addition of 350 ml ethyl alcohol and 150 ml water.

Answer 2

ANSWER:

350 ml of ethyl alcohol and 150 ml of water