Question

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. 0.975 M
• B. 0.875 M
• C. 1.00 M
• D. 1.75 M

Answer 1

The correct option is B 0.875 M

$M_{mix}{V}_{mix}=M_1{V}_1+M_2{V}_2{M}_{mix}=\frac{M_1{V}_1+M_2{V}_2}{V_{mix}}=\frac{(0.5\times 750)+(2\times 250)}{1000}=0.875M$