10 mL ethanol is mixed with water to make 250 mL solution. Then 50 mL of this solution is diluted to 200 mL. What is the volume percent of ethanol in the final solution?
Answer and explanation
Correct answer: 1.0 percent
The first solution has 10 mL ethanol in 250 mL, so its volume percentage is 4%. A 50 mL sample therefore contains 0.04 × 50 = 2 mL ethanol. After dilution to 200 mL, the percentage becomes (2/200) × 100 = 1%. Dilution changes concentration but not the ethanol volume in the portion.
Frequently asked questions
What is the correct answer to this question?
1.0 percent
Why is this the correct answer?
The first solution has 10 mL ethanol in 250 mL, so its volume percentage is 4%. A 50 mL sample therefore contains 0.04 × 50 = 2 mL ethanol. After dilution to 200 mL, the percentage becomes (2/200) × 100 = 1%. Dilution changes concentration but not the ethanol volume in the portion.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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