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Solution Equilibrium. A pink solution is warmed and becomes blue Upon cooling it becomes pink again, demonstrating a reversible chemical change. Purpose. To shift a chemical equilibrium by temperature alone

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SolutionEquilibrium

A pink solution is warmed and becomes blue

Upon cooling it becomes pink again,

demonstrating a reversible chemical change


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Purpose

  • To shift a chemical equilibrium by temperature alone

  • To observe the color change which occurs and relate it to the chemical reaction for the demonstration


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Demonstration

  • The chemical equation for the reaction was

    Co(H2O)62+ + 4Cl-CoCl42- (aq) + 6H2O

    Higher temperatures shift the equilibrium to the blue

    CoCl42-specie

    Lower temperatures favor the pink

    Co(H2O)62+specie

    Thus, the reaction adjusted to its environment!


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Concepts

1. Reversible Chemical Reactions

2. Chemical Equilibria

3. Hydrated Ions


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1. Reversible Chemical Reactions

  • Not all chemical reactions convert reactants completely to products

    A + B C + D

  • Many reactions will contain ALL species rather than converting completely

    A + B C + D

  • The double arrow indicates the reaction is reversible and both A and B as well as C and D are simultaneously present when the reaction is finished


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2. Chemical Equilibrium

  • In a reversible chemical reaction

    • A + B C + D

    • reactants are said to be

    • “in equilibrium” with their products

  • Equilibria may lie

    • more toward products

    • A + B C + D

      • or

  • more toward reactants

  • A + B C + D


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    3. Hydrated Ions

    • Ions in aqueous solution are surrounded by a shell of water

    • Such ions are said to be hydrated

    • Hydrated ions such as sodium ion are written as Na+(aq) where aq is Latin for aqua, meaning ‘water’


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    Conclusions

    • The equilibrium of a solution at a given temperature shifted when the temperature was changed

    • The change was noted by the color change from the pink, hydrated ion to the blue, anhydrous ion

    • The change was reversible


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    Comments

    • Most chemical reactions of

      biochemical systems are at

      equilibrium


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