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200 mL of 0.5 M KCl is combined with 50 mL of 19% w/v MgCl2, and the mixture is then diluted to 8 times its volume. What is the molarity of chloride ion in the final solution?

1. 0.15 M
2. 0.075 M
3. 0.30 M
4. 0.10 M

Correct answer: 0.15 M

Solution

Total Cl- moles divided by the final diluted volume gives 0.15 M.

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