Lab11_CoordinationCompound

Lab11_CoordinationCompound - C 125 Ex eimntal Che istry 1...

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Coordination Chemistry C125 Prelab C125 Exp er im en tal Che m i st ry 1
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Purpose Investigate what is meant by: Coordination Compound Redox Titration Analysis Determine : Experimental yield of a coordination compound Purity of a coordination compound
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Important Terms for This Experiment Donor Atom Ligand Chelating Agent Coordination Compound Counter Ions (Above terms will be learned in C105 later; reviewing them will help you understand your lab, but they are not required now.) Redox Titration Reaction Yield Percent Yield Purity
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Oxidation States of Fe Transition metals can have multiple oxidation states Iron has two common states: +2, +3 Electrons in a partially filled d sublevel can absorb visible wavelengths of light and move to slightly higher energy d orbitals Many transition metal compounds have color The color seen is indicative to the oxidation state of the transition metal In this experiment, iron changes from +2 to +3 oxidation states Fe(II) = yellow Fe(III) = green
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Definition of Ligand A molecule or an ion that is bonded to the metal ion in a complex ion Molecules or ions that surround the metal in a complex ion Ligands are characterized by the number of attachments it can make with a coordinating atom Monodentate = 1 (tooth) binding site Bidentate = 2 (teeth) binding sites Polydentate = many (teeth) binding sites Which molecule/ion is the ligand in the final product of this experiment?
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Ligand Examples Monodentate = 1 (tooth) binding site Water Cyanide O H H C- N
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Ligand Examples Bidentate = 2 (teeth) binding sites Enthylenediamine Oxalate H 2 C NH 2 CH 2 NH 2 C O - O C O O -
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Ligand Examples Polydentate = many (teeth) binding sites Triphosphate O P O - -O O P O - O O P O - O - O 5-
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Definition of Chelating Agent A substance that forms complex ions with metal ions in solution Bidentate and polydentate ligands are also called chelating agents because of their ability to hold the metal atom like a claw
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Lab11_CoordinationCompound - C 125 Ex eimntal Che istry 1...

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