Question

Equal volumes of 0.1 M $AgN{O}_3$ and 0.2M NaCl are mixed. The concentration of ion resultant solution will be:

• A. 0.1M
• B. 0.05M
• C. 0.2M
• D. 0.15M

Answer 1

The correct option is B 0.05M

$\left[N{O}_3^{-}\right]$ in 0.1M $AgN{O}_3=0.1M$
When mixed with equal volume of 0.2M
NaCl solution, the volume of solution is double. So concentration of $\left[N{O}_3^{-}\right]$ is halved.
$\therefore \left[N{O}_3^{-}\right]=\frac{0.1}{2}=0.05M$