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Question
Give a chemical test to show that \[\ce{[Co(NH3)5Cl]SO4}\] and \[\ce{[Co(NH3)5SO4]CI}\] are ionisation isomers.
Solution
\[\ce{[Co(NH3)5Cl]SO4}\] produces a white precipitate when mixed with BaCl2. This test yields no response from \[\ce{[Co(NH3)5SO4]Cl}\]. In contrast, \[\ce{[Co(NH3)5SO4]Cl}\] produces a white precipitate in the presence of silver nitrate, whereas \[\ce{[Co(NH3)5Cl]SO4}\] does not. These results demonstrate that \[\ce{[Co(NH3)5Cl] SO4}\] and \[\ce{[Co(NH3)5SO4]Cl}\] are ionisation isomers.
- \[\ce{[Co(NH3)5Cl]SO4 <=> [Co(NH3)5Cl]^2- + SO^2-_4 ↓ BaCl2 \underset{White ppt.}{BaSO4}}\]
However, it does not react with AgNO3 - \[\ce{[Co(NH3)5Cl]SO4 ->[AgNO3] No reaction}\]
- \[\ce{[Co(NH3)5SO4]Cl <=> [Co(NH3)5SO4]+ +Cl- ->[AgNO3] \underset{White ppt.}{AgCl}}\]
But it does not react with the BaCl2 solution - \[\ce{Co(NH3)5SO4]Cl ->[BaCl2] No reaction}\]
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