[Pico]

In the complex [Co(en)2(H2O)2]Cl3, how could you experimentally determine whether the Cl ions are not bound directly to the central Co(III) atom?

Also if the complex was treated with oxalate, two complexes are isolated [Co(en)2(ox)(H2O)]Cl and [Co(en)2(ox)]Cl. Would there be a preference for (ox) being monodentate or bidentate? Why are both formed? Would there be two diastereoisomers of [Co(en)2(ox)(H2O)]Cl and two enantiomers for [Co(en)2(ox)]Cl?

Thanks in advance

[Hunter2]

Hint: how to detect chloride?