Question

If $200ml2MAlC{l}_3$ solution is mixed with $300ml1MCaC{l}_2$ solution. Which of the following is correct statement regarding final solution?

• A. $\left[A{l}^{3+}\right]=0.8M$
• B. $\left[C{l}^{-}\right]=3.6M$
• C. $\left[C{a}^{2+}\right]=0.6M$
• D. all are correct

Answer 1

Answer: (D)

$\left[A{l}^{3+}\right]=\frac{M_1{V}_1}{V_1+V_2}=\frac{200\times 2}{500}=\frac{4}{5}=0.8$
$\left[C{l}^{-}\right]=\frac{3M_1{V}_1+2M_2{V}_2}{V_1+V_2}=\frac{3\times 2\times 200+2\times 1\times 300}{500}$
$=\frac{12+6}{5}=\frac{18}{5}=3.6M$
$\left[C{a}^{+2}\right]=\frac{300\times 1}{500}=\frac{3}{5}=0.6$