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Question
Give evidence that [Co(NH3)5Cl]SO4 and [Co(NH3)5SO4]Cl are ionisation isomers.
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Solution
Ionisation isomers dissolve in water to give different ions, hence giving different reactions with different reagents.
\[\ce{[Co(NH3)5Cl]SO4 + Ba^{2+} -> BaSO4_{(s)}}\]
\[\ce{[Co(NH3)5SO4]Cl + Ba^{2+} -> {No Reaction}}\]
\[\ce{[Co(NH3)5Cl]SO4 + Ag^+ -> {No Reaction}}\]
\[\ce{[Co(NH3)5SO4]Cl + Ag^+ -> AgCl_{(s)}}\]
Since the given complexes give different reactions with different reagents, they are ionisation isomers.
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