of a solution is diluted to . What is the new molarity (in M)?
Answer and explanation
Correct answer: A. 3/10
**
- Step 1: The amount of solute remains constant upon adding solvent: .
- Step 2: Solving for the new molarity gives .
- Step 3: Plug in , , and diluted volume : .
Answer
3/10.
Why not the others: '3' arbitrarily halves the concentration without using the actual volume ratio; '120' inverts the dilution ratio (), incorrectly predicting a concentrated solution; '6' is the initial undiluted molarity before addition of water.
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