Twenty five litres of 60% concentration of acid solution is added to 35 litres…
2019
Twenty five litres of 60% concentration of acid solution is added to 35 litres of 80% concentration of acid solution. What is the concentration of acid in the new solution? (correct to one decimal place)
Answer: B. 71.7% — Acid in 25 litres of 60% solution = 15 litres. Acid in 35 litres of 80% solution = 28 litres. Total acid = 43 litres and total solution = 60 litres. New…
- A.
62.5%
- B.
71.7%
- C.
60.7%
- D.
55.7%
Attempted by 17 students.
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Correct answer: B
Acid in 25 litres of 60% solution = 15 litres.
Acid in 35 litres of 80% solution = 28 litres.
Total acid = 43 litres and total solution = 60 litres.
New concentration = 43/60 x 100 = 71.7% approximately.
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