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Solution Equilibrium

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collapsing can - PowerPoint PPT Presentation


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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

purpose
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
demonstration
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!

concepts
Concepts

1. Reversible Chemical Reactions

2. Chemical Equilibria

3. Hydrated Ions

1 reversible chemical reactions
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
2 chemical equilibrium
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
3 hydrated ions
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’
conclusions
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
comments
Comments
  • Most chemical reactions of

biochemical systems are at

equilibrium

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