The anion (COO)2 has the charge 2-.
For example sodium oxalate has the chemical formula Na2C2O4.
The formula for ferric oxalate is Fe(C2O4)3.
The chemical formula for molybdenum oxalate is Mo(C2O4)2.
Formula of ammonium oxalate monohydrate: (NH4)2C2O4.H2O
The chemical formula for Calcium Oxalate is CaC2O4
For example sodium oxalate has the chemical formula Na2C2O4.
The chemical formula for stannic oxalate is Sn(C2O4)2.
The formula for ferric oxalate is Fe(C2O4)3.
I think the formula of aluminate is AlO2 and valency is 1
The chemical formula of zinc oxalate is C2O4Zn.
The chemical formula for molybdenum oxalate is Mo(C2O4)2.
Formula of ammonium oxalate monohydrate: (NH4)2C2O4.H2O
The chemical formula for Calcium Oxalate is CaC2O4
The chemical formula for manganese II oxalate is MnC2O4.
The formula of iron(III) oxalate is C6Fe2O12.
The formula for ammonium ion is NH4+ and the formula for oxalate ion is C2O4^2-.
The chemical formula for lithium oxalate is Li2C2O4. It consists of two lithium (Li) ions and one oxalate (C2O4) ion.