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The molarity of a solution obtained by mixing 750 ml. of 0.5 (M) HCl with 250 ml of 2(M) HCl will be

A) 0.875 M

B) 1.00 M

C) 1.75 M

D) 0.0975 M

Option A

$M_{f}=\frac{M_{1}V_{1}+M_{2}V_{2}}{V_{1}+V_{2}}$

$=\frac{750\times0.5+250\times2}{750+250}=\frac{875}{1000}$

=0.875 M

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