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Chemical Equilibrium and the Equilibrium Constant

Outline. PurposeChemical EquilibriumReactionCalculationsBeer's LawSpectrophotometersBuret RemindersSafety ConcernsPrecautionsWhat to turn in

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Chemical Equilibrium and the Equilibrium Constant

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    1. Chemical Equilibrium and the Equilibrium Constant Experiment 1

    2. Outline Purpose Chemical Equilibrium Reaction Calculations Beer’s Law Spectrophotometers Buret Reminders Safety Concerns Precautions What to turn in… Experiment 2 reminder Lab Computer Etiquette Did you…

    3. Purpose Students will determine the equilibrium constant of [Fe(SCN)]2+ complex by reacting Fe3+ and SCN-. Students will become experienced using a spectrophotometer and making solutions of the required concentrations. The MicroLAB spreadsheet will be used to calculate the initial and equilibrium concentrations of Fe3+, SCN-, and [Fe(SCN)]2+. Once the data is entered into the spreadsheet, the calculation of the equilibrium constant can be completed.

    4. Chemical equilibrium Not all reagents are always converted to product. In most cases, dynamic equilibrium is established once most of the limiting reagent has been used. At equilibrium, the rates of the forward and reverse reactions are equal.

    5. Dynamic Equilibrium Initially ?[R] ? ?[P] forward rxn = fast reverse rxn = slow Later ?[R] ? ?[P] forward rxn = slow reverse rxn = fast Equilibrium [R] ? [P] rates are equal

    6. Equilibrium Conditions [R]eq and [P]eq are related through K aA + bB ? cC + dD K =

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