Synthesis of [Co(NH3)5Cl]Cl2:

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Synthesis of [Co(NH3)5Cl]Cl2:

Kinetics of Reaction

Introduction

        In this experiment, the substance was tested at on temperature (85 degree Celsius), the rate constant for the substance at 60 degrees Celsius was given, and the remaining temperatures (the other 5) were obtained from a posting of other group’s calculations.  For the preparation of the compound pentaamminechlorocobalt(III)chloride, compounds [Co(NH3)4CO3]NO3, HCl concentrate, and NH3 concentrate are experimentally combined.  The first reason that this experiment is useful is because the compound would in future weeks, be used for following experiments to determine both rate constant and activation energy of pentaamminechlorocobalt(III)chloride.  Other reasons to study synthesis and kinetics using hydrolysis would help to determine the behavior of the reaction as being independent or dependent of a base-catalyst 1.  Also, by understanding the kinetics of this compound, other, more complex compounds, can be easier to understand.  Learning and understanding behaviors of the hydrolysis can help to make better predictions when like compounds react in other similar mixings of compounds 4.  Kinetics is the study of motion.  In the study of kinetics of the compound being prepared, the H+ ion movement can be determined 3.  Having a model of this reaction can be useful in predicting reaction kinetics for similar reactions.

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Experimental

(Experiment 1 Handout, PLU Department of Chemistry)

        In this experiment, pure ethanol was used.  Also the HCl and NH3 was a concentrate.  First, 5.0 grams of [Co(NH3)4CO3]NO3 was dissolved in 50 mL of H2O in a beaker.  When the 5 to 10 mL of HCl was added to the previous solution, the CO2 was expelled and HCl was added until all of the CO2 was expelled.  When the NH3 was added (about 5mL) the solution was being neutralized until the pH paper read that neutralization was obtained.  The solution was heated for 20 minutes at a temperature just below boiling point.  Heating the ...

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