If 50 mL of a 2 M solution is diluted with water to 250 mL, what is the new molarity?
Answer and explanation
Correct answer: 0.4 M
The governing principle of dilution is conservation of solute: adding water changes the volume but not the moles of solute. Therefore, M₁V₁ = M₂V₂. Substitution gives M₂ = (2 M × 50 mL) / 250 mL = 0.4 M. Hence option A is correct. Option B wrongly keeps the original concentration, C does not account for the full volume increase, and D is lower than the calculated value.
Frequently asked questions
What is the correct answer to this question?
0.4 M
Why is this the correct answer?
The governing principle of dilution is conservation of solute: adding water changes the volume but not the moles of solute. Therefore, M₁V₁ = M₂V₂. Substitution gives M₂ = (2 M × 50 mL) / 250 mL = 0.4 M. Hence option A is correct. Option B wrongly keeps the original concentration, C does not account for the full volume increase, and D is lower than the calculated value.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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