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Experiment 15: Synthesis and Analysis of a Coordination Compound for AP Chemistry

By — McGraw-Hill Professional
Updated on Feb 8, 2011

For a quick review on stoichiometry, refer to the following concepts:

Synopsis

A coordination compound is usually synthesized from a transition metal ion that is in solution. The compound is filtered from the solution and tested in various ways to determine the composition of the substance. (See the Reactions and Periodicity chapter.)

Equipment

      analytical balance
      beaker(s)
      Erlenmeyer flask
      evaporating dish
      pipet
      spectrophotometer
      test tube(s) or cuvettes
      test tube(s) or cuvettes

Measurements

Synthesis

Quantities of the reactants are weighed and added to a beaker. A solvent may or may not be present initially.

The mass of the product is determined by weighing.

 

Weigh a sample of the compound into a volumetric flask, and dilute to volume.

Use a pipet to measure samples to be diluted.

Measure absorbency of the diluted solutions with a spectrophotometer. This may or may not require the separate construction of a calibration curve.

Calculations

Calculate the moles of each reactant from the masses and molar masses. Then calculate the yield based on the limiting reagent. The mass of the product, determined at the end of the synthesis, divided by the mass calculated from the limiting reagent times 100%, gives the percent yield.

There are numerous possible analysis calculations.

Comments

Commonly synthesized coordination compounds include K3[Fe(C2O4)3] and [Co(NH3)6]Cl3.

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