Multiple choice

A solution contains 50 mL vinegar in 200 mL water. If the volume of the solution is doubled by adding water, what is the percentage change in the concentration?

  1. Increase by 10%

  2. Increase by 20%

  3. Decrease by 10%

  4. Decrease by 50%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initial concentration = 50 / 250 = 20%. Final volume = 500 mL. New concentration = 50 / 500 = 10%. Change = (10 - 20) / 20 = -50%.

AI explanation

The initial concentration is 50 mL of vinegar divided by the total 250 mL volume, yielding a 20 percent concentration. Doubling the volume by adding water brings the total volume to 500 mL while the vinegar remains 50 mL, resulting in a new concentration of 10 percent. Comparing the initial 20 percent to the final 10 percent shows the concentration decreases by 50 percent.

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