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

1 Answer
Truong-Son N.
Oct 28, 2017

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.

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