The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 mL of 2 M HCl will be

0.875 M

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1.00 M

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1.75 M

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0.0975M

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Solution

The correct option is A 0.875 M
From the formula, $M_{f} = \frac{M_{1} + M_{2} V_{2}}{V_{1} + V_{2}}$
Given, $V_{1} = 750 m L, M_{1} = 0.5 M$
$V_{2} = 250 m L, M_{2} = 2 M$
$= \frac{750 \times 0.5 + 250 \times 2}{750 + 250} = \frac{875}{1000} = 0.875 M$

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