Question

Synthesis and Analysis of a Copper Oxalate Complex (Formal Report) This is a 3-week experiment and it will be the basis for your formal report, details to follow. Coordination complexes are molecules or ions formed when a central metal ions form bonds to nonmetal ligands. These interactions are Lewis acid/base interactions where the metal ion acts as a Lewis acid and the ligand acts as a Lewis base. For example, a common coordination compound is the copper ammine complex [Cu(NH3),], where Cu* acted as the metal ion and NH3 acted as the nonmetal ligand. Copper is known to form coordination complexes with a variety of other ligands, including water and oxalate. Copper oxalate complexes can be synthesized by reacting copper (II) sulfate pentahydrate with excess potassium oxalate monohydrate: Ĉuso, • 5 H2O + K,C,0,H,O → K. [Cus(C30.).] • d H2O Note that the above equation is not balanced and that other products, such as K SO., are not shown. Unlike ammine ligands - which can only form a single bond with the copper ion - a single oxalate ligand binds to the copper ion in two places through two of its oxygen atoms (Figure 1); therefore, oxalate is known as a bidentate ligand.

Answer 1

CuSO4.5H2O + K2C2O4 .H2O .forms K2[Cu2(C2O4)2].2H2O

So in the above copper oxalate complex a, b,c,d will be

a= 2

b= 1

c=2

Also d=2

Molar mass of K2[Cu(C2O4)2]2H2O is 575.3799 g/mol .