Question

Write the IUPAC name of the ionisation isomer of the co-ordination compound [Co(NH₃)₅Br] SO₄. Give one chemical test to distinguish between the two compounds.

Answer 1

The ionisation isomer is [Co(NH₃)₅SO₄]Br. The IUPAC name is Pentaamminesulphatocobalt (III) bromide.

The isomer [Co(NH₃)₅Br]SO₄ gives a white precipitate of BaSO₄ with BaCl₂ solution whereas the isomer [Co(NH₃)₅SO₄]Br does does not form this precipitate. (or any other relevant test.