Question
Give evidence that $[Co(NH_3)_5Cl]SO_4$ and $[Co(NH_3)_5SO_4]Cl$ are ionisation isomers.
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Answer
The ionisation isomers dissolve in water to yield different ions and thus react differently to various reagents:
$[Co(NH_3)_5Cl]SO_4 + Ba^{2+} → BaSO_4(s) ↓$
$[Co(NH_3)_5SO_4]Cl + Ba^{2+} →$ No reaction
$[Co(NH_3)_5Cl]SO_4 + Ag^+ →$ No reaction
$[Co(NH_3)_5SO_4] Cl+ Ag+ → AgCl(s)$
$[Co(NH_3)_5Cl]SO_4 + Ba^{2+} → BaSO_4(s) ↓$
$[Co(NH_3)_5SO_4]Cl + Ba^{2+} →$ No reaction
$[Co(NH_3)_5Cl]SO_4 + Ag^+ →$ No reaction
$[Co(NH_3)_5SO_4] Cl+ Ag+ → AgCl(s)$
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