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 cararge of the complex ion and the oxidation number of the complexing agent. CuSO4+NH4OH (excess) CN=4 KH([Cu(NH3)4]2+)=2,11013;KH([Cu(CN)4]2)=5,01028 2. KH=2,4.1001, oSP K4[Hg(CN)6] swith a concentration 0,05 mol/L, containing an excess of ligands as KCN with a molar concentration 0,1mol/L. S . S . *(ne) - number of unpaired electrons of the complexing agent ion