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Asked by aastharoy997 | 27 May, 2020, 11:07: AM
answered-by-expert Expert Answer
Question: A solution of 140 litres of acid contains 10% of acid and the remaining is water. How many litres of acid must be added so that the concentration of acid becomes 1/8 of the solution?
Solution:
140 litres of solution contains 10% of acid and so the remainin 90% is water.
Quantity of acid = 10% of 140 = 10/100 x 140 = 14 litres
Quantity of water = 90% of 140 = 90/100 x 140 = 126 litres
Let 'a' litres of acid must added, therefore we have
(140+a)*1/8=14+a
140+a = 112+8a
7a=28
a=4
Hence, 4 litres of acid must be added so that the concentration of acid becomes 1/8 of the solution.
Answered by Renu Varma | 27 May, 2020, 12:11: PM

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