Question

The molarity of solution obtained by mixing 500 mL of 2 M $HN{O}_3$ and 250 mL of 0.5 M HCl and 250 mL of water will be

• A. 1.5 M
• B. 1.125 M
• C. 1.75 M
• D. 1.35 M

Answer 1

The correct option is B 1.125 M

$M_{resultant}=\frac{M_1{V}_1+M_2{V}_2}{V_1+V_2+V_3}=\frac{(500\times 2\times 1)+(250\times 0.5\times 1)}{1000}=\frac{1000+125}{1000}=1.125M$