Question

Equal volumes of 0.1 M $AgNO_3$ and 0.2 M NaCl are mixed. The concentration of $NO^-_3$ ions in the mixture will be

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

Answer 1

Answer: (B)

0.05 M

Answer 2

$\underset{0.1 \,M }{ AgNO _{3}} \longrightarrow Ag ^{+}+\underset{0.1 m \rightarrow \text { volume }= N _{3}^{-}}{ N _{1}}$
$M_{1}\, V_{1}=M_{2}\, V_{2}$ Equal volume
$0.1 \times V=M_{2}\left[V_{1}+V_{2}\right] \,\,\,\left[N_{1}=V_{2}=V\right]$
$0.1 \times V=M_{2}[V+V]$
$M _{2}=\frac{0.1 V }{2 V }=0.05$