A) \[3\times {{10}^{-4}}M\]
B) \[2\times {{10}^{-4}}M\]
C) \[{{10}^{-4}}M\]
D) None of these
Correct Answer: A
Solution :
| [a] |
| \[\frac{mass\text{ }of\text{ }A{{l}_{2}}{{\left( S{{O}_{4}} \right)}_{3}}}{mass\text{ }of\text{ }water}\times {{10}^{6}}=34.2\] |
| 1 litre solution contains 1000 g of water |
| \[\Rightarrow \] In 1 litre solution, mass of \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}=\frac{34.2\times 1000}{{{10}^{6}}}=34.2mg\] |
| Molarity of \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}=\frac{34.2\times {{10}^{-3}}}{342}M={{10}^{-4}}M\] |
| \[\underset{{{10}^{\,-\,4}}M}{\mathop{A{{l}_{2}}{{(S{{O}_{4}})}_{3}}}}\,(aq)\xrightarrow{{}}\underset{2\,\,\times \,\,{{10}^{-4}}M\,\,\,\,\,\,\,\,\,\,\,3\,\,\times \,\,{{10}^{-4}}M}{\mathop{2A{{l}^{3+}}(aq)+3SO_{4}^{2-}(aq)}}\,]\,\,\,\,\,\,[\left[ SO_{4}^{2-} \right]=3\times {{10}^{-4}}M]\text{ }\!\!~\!\!\text{ }\] |
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