of a solution is diluted to . What is the new molarity (in M)?

Answer and explanation

Correct answer: B. 2

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  1. Step 1: Apply the dilution equation , which expresses conservation of moles of solute during dilution.
  2. Step 2: Rearrange to solve for the final molarity: .
  3. Step 3: Substitute , , and : .
Answer
2.
Why not the others: '10' is the initial undiluted molarity before addition of water; '5' is the dimensionless dilution factor (), not the final molarity; '50' inverts the dilution ratio (), incorrectly predicting a concentrated solution.

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