Question

If $200\, ml \,2M\, AlCl_3$ solution is mixed with $300 \,ml \,1\,M \,CaCl_2$ solution. Which of the following is correct statement regarding final solution?

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

Answer 1

Answer: (D)

${\left[ Al ^{3+}\right]=\frac{ M _1 V _1}{ V _1+ V _2}=\frac{200 \times 2}{500}=\frac{4}{5}=0.8} $
${\left[ Cl ^{-}\right]=\frac{3 M _1 V _1+2 M _2 V _2}{ V _1+ V _2}=\frac{3 \times 2 \times 200+2 \times 1 \times 300}{500}}$
$=\frac{12+6}{5}=\frac{18}{5}=3.6 M $
${\left[ Ca ^{+2}\right]=\frac{300 \times 1}{500}=\frac{3}{5}=0.6}$