Answers

2016-02-18T17:24:39+05:30
Initially

The total mass = 20 oz

=> Mass of acid = 1/20 * 20 oz = 1 oz

=>Mass of water = 19 oz

Now lets add x oz of acid

Total volume of acid is (1 + x) oz

Total mass of solution = (20 + x) oz

Concentration = 24#

=> 0.24 = (1+x)/(20+x)

Solving for x you get 

x = 5

Therefore 5 oz of pure acid must be added
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2016-02-18T17:28:39+05:30
5 oz of pure acid must be added
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