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Molarity

500 mL of a 0...

Question

500 mL of a 0.2 M solution has 200 mL of water added to it. What is the new molarity of this solution?

A

0.50 M

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B

0.28 M

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C

0.70 M

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D

0.14 M

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E

0.40 M

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Solution

The correct option is E 0.14 M
$M_{1} V_{1} = M_{2} V_{2}$
$M_{1} = 0.2$ M
$V_{1} = 500$ mL
$M_{2} =$ ??
$V_{2} = 500 + 200 = 700$ mL
$0.2 \times 500 = M_{2} \times 700$
$M_{2} = 0.14$ M

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