Question

[Co(H2O)6] [Ag(CN)2]3 , what its name according IUPAC?

Answer 1

You'll have to separate this into the cation and anion. The anion charge is more well-defined, being:

`["Ag"("CN")_2]^-`

since `"Ag"^(+)` is the only cation that silver is known to form, and `"CN"^(-)` is the cyano ligand. Note that silver comes from the latin, argentum.

Knowing that there are three monoanions, the charge of the cation must be `+3` since water is clearly a neutral molecule:

`["Co"("H"_2"O")_6]^(3+)`

As a result, we recall the ligands:

• `"CN"^-`, cyano
• `"H"_2"O"`, aqua

We therefore name this, including the prefixes:

`["Co"("H"_2"O")_6]["Ag"("CN")_2]_3`

`color(blue)"hexaaquacobalt(III) dicyanoargentate(I)"`

remembering to include oxidation states on the metals, and to put the anion second.