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Molarity

20 mL of 0.5 ...

Question

20 mL of 0.5 M HCl is mixed with 30 mL of 0.3 M HCl, the molarity of the resulting solution is:

A

0.8 M

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B

0.53 M

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C

0.38 M

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D

0.83 M

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Solution

The correct option is C 0.38 M
$M_{1} V_{1} + M_{2} V_{2} = M_{R} (V_{1} + V_{2})$

where $M_{R} =$ resultant molarity of the mixture.

$\Rightarrow 0.5 \times 20 + 0.3 \times 30 = M_{R} \times 50$

$M_{R} = 0.38 M$

Hence, the correct option is $C$

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