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Molarity

If 200ml so...

Question

If $200$ ml solution of $0.5$ M $N a O H$ is diluted to $800$ ml then find molarity of resultant solution.

A

0.250

M

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B

0.125

M

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C

0.225

M

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D

0.4

M

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Solution

The correct option is B $0.125$ M
We know that
$M_{1} V_{1} = M_{2} V_{2}$

Here,
$M_{1} = 0.5 M; V_{1} = 200 m L; V_{2} = 800 m L$

$M_{2} = \frac{M_{1} V_{1}}{V_{2}} = \frac{0.5 \times 200}{800} = 0.125 M$

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