Chemistry Cobalt Complexes & Le Chateliers Principle Lab Report

Assignment

Complete the ChemCollective lab.

  • View the orientation video to learn how to use the ChemCollective website.

This file is downloadable: cobalt_BYH.pdf download

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For help with ChemCollective and with the Excel sheet, you can view the video below. You need to conduct the experiment on the ChemCollective simulator, so I have blurred out some sections in the video.

Discussion: Color changesUses experimental observations to explain whether color changes observed in steps 1-4 consistent with Le Chatelier’s Principle?

10 pts

Full Marks

0 pts

No Marks

10 pts

This criterion is linked to a Learning OutcomeDiscussion: Endothermic or exothermicUses description of results to explain whether the reaction (as written in the Background) endothermic or exothermic.

10 pts

Full Marks

0 pts

No Marks

10 pts

This criterion is linked to a Learning OutcomeDiscussion: KcUses quantitative experimental results to explain whether changing the concentration of reactant or product change the equilibrium constant for a reaction?

10 pts

Full Marks

0 pts

No Marks

10 pts

This criterion is linked to a Learning OutcomeDiscussion: Effect of temperature on KcUses quantitative experimental results to explain whether hanging the temperature of a reaction change the equilibrium constant?
Uses quantitative experimental results to explain temperature affects the equilibrium constant for an endothermic reaction? (or how does temperature affect the equilibrium constant for an exothermic reaction?)

10 pts

Full Marks

0 pts

No Marks

10 pts

This criterion is linked to a Learning OutcomeAnalysis and FormatDiscussion is written in complete sentences and in paragraph form.
Results were adequately recorded and calculated correctly.

Solution Equilibria: Cobalt(II) complex ions

In this section, you will examine an equilibrium reaction that occurs in solution. The reaction examined will use something called a complex ion. Many transition metal ions can form bonds with electron rich compounds or ions. These complexes often exhibit different colors, depending on what is bound. In this simulation, we will examine the reaction between hexaaquacobalt(II) ion in equilibrium with tetrachlorocobaltate(II) ion. The cobalt(II) ion bound to water is a pink color where as the cobalt(II) ion bound to chloride ions is blue.

Co(H2O)2+6(aq)+4Cl(aq)CoCl24(aq)+6H2O(l)Co(H2O)62+(aq)+4Cl(aq)CoCl42(aq)+6H2O(l)

Co Equilibrium reaction

Image Credit: http://www.docbrown.info/page07/transition07Co.htm

Watch the following video for see what the equilibrium looks like in a real lab setting.

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