1. Write the reaction equations for complex formation. For complex compound in the first reaction, indicate: a) the internal and external spheres; the central atom (complexing agent) and ligands; b) the charge of the complex ion and the oxidation number of the complexing agent. CuSO4+NH4OH (excess) CN=4 [Cu(NH3)4]Cl2+NaCN (excess) KH([Cu(NH3)4]2+)=2,11013;KH([Cu(CN)4]2)=5,01028 2. KH=7,8.10-18, oSP coK2[Cd(CN)4] with a conceptration 0,05mol/L, containing an excess of ligands as KCN with a molar sencentration 0,1mol/L. 3. For the complex ion [Pt(CN)4]2 (ne =0) SP S . S . * (ne) - number of unpaired electrons of the complexing agent ion