CHEM 177 Lecture Notes - Lecture 6: Complex Number, Due Date, Spectrophotometry
4 Jul 2016
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Document Summary
To determine the actual stoichiometry of the various nickel-ethylene- diamine-aqua complexes synthesized from differing molar ratios of reagents. Once stoichiometry is known to determine the limiting reagent, theoretical yield and actual % yield from the synthesized product. Recognition that more than one coordination complex of nickel, ethylenediamine and water was synthesized in the earlier experiment and that the relative population of ligands in each product is dictated by the coordination number of nickel. Understanding that the amount of ni2+ in a synthesized complex can be determined from a standard curve of absorbance as function of ni2+ concentration and that acid titration can determine the amount of ethylenediamine in each complex. Based on the ni2+ and en composition found, demonstrate an ability to apply the stoichiometry of a chemical reaction which formed the analyzed product to determine the limiting reagent and theoretical yield of that product. Determination since transition metal cations like ni2+ absorb light at characteristic of complex.
