A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride…
2024
A tank contains 10,000 gallons of a solution that is 5 percent sodium chloride by volume. If 2,500 gallons of water evaporate from the tank, the remaining solution will be approximately what percent sodium chloride?
- A.
1.25%
- B.
3.75%
- C.
6.25%
- D.
6.67%
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Correct answer: D
Key idea: the amount of salt stays the same when only water evaporates.
Initial amount of salt = 5% of 10,000 = 0.05 × 10,000 = 500.
Remaining total volume after evaporation = 10,000 − 2,500 = 7,500.
New concentration = (500 ÷ 7,500) × 100% = 6.666...% ≈ 6.67%.
Therefore, the remaining solution is approximately 6.67% sodium chloride.