Twenty-five litres of 40% acid solution is mixed with 35 litres of 70% acid…
20202020
Twenty-five litres of 40% acid solution is mixed with 35 litres of 70% acid solution. What is the concentration of acid in the resulting solution?
- A.
57.5%
- B.
55%
- C.
60%
- D.
62.5%
Attempted by 33 students.
Show answer & explanation
Correct answer: A
Given:
25 litres of 40% acid solution
35 litres of 70% acid solution
Amount of acid in first solution:
= 40% of 25
= (40/100) × 25
= 10 litres
Amount of acid in second solution:
= 70% of 35
= (70/100) × 35
= 24.5 litres
Total acid:
= 10 + 24.5
= 34.5 litres
Total solution:
= 25 + 35
= 60 litres
Concentration of acid in new solution:
= (34.5/60) × 100
= 57.5%