of a solution is diluted to . What is the new molarity (in M)?
Answer and explanation
Correct answer: B. 4/25
**
- Step 1: Apply the dilution equation , which expresses conservation of moles of solute during dilution.
- Step 2: Rearrange to solve for the final molarity: .
- Step 3: Substitute , , and : .
Answer
4/25.
Why not the others: '2' arbitrarily halves the concentration without using the actual volume ratio; '4' is the initial undiluted molarity before addition of water; '100' inverts the dilution ratio (), incorrectly predicting a concentrated solution.
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