Question

What is the IUPAC name of $N{a}_3\left[Ag\right(S_2{O}_3{)}_2]$?

• A. Sodium dithiosulphatoargentate (I)
• B. Sodium bis(thiosulphato)argentate (I)
• C. Sodium di(thiosulphato) silver (I)
• D. Sodium bis(thiosulphato) silver (I)

Answer 1

The correct option is A Sodium dithiosulphatoargentate (I)

There are two of the thiosulphate $S_2{O}_3^{2-}$ ligands. Hence, we need to use di. The cation is Sodium - which almost always exists in its +1 oxidation state in compounds.

The anion is $\left[Ag\right(S_2{O}_3{)}_2{]}^{3-}$.With an anionic charge of -3, silver is definitely in its +1 oxidation state. According to the IUPAC rules, we should have argentate (I) to denote the silver (+1). Hence, the IUPAC name is: Sodium dithiosulphatoargentate (I)