Lecture 2_09_09A0

Lecture 2_09_09A0 - Chapter 14 Chemical Equilibrium 1...

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1 Chapter 14: Chemical Equilibrium
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2 Lecture Outline Mini-exam 1 results Drop/add deadline TODAY LON-CAPA Lab Equilibrium Expectations for next lecture
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3 + Lab Experiment Introduction: Chemical Equilibrium Fe 3+ + SCN - FeSCN 2+ yellow colorless red
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4 Fe 3+ + SCN - FeSCN 2+ Determination of Equilibrium Constant What are the initial concentrations? How can we express the concentrations at the  equilibrium? You will determine the equilibrium  concentration of FeSCN +2   Experimentally [FeSCN 2+ ] [Fe 3+ ][ SCN - ] Keq =
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5 Fe 3+ + SCN - FeSCN 2+ Determination of Equilibrium Constant What are the initial concentrations? How can we express the concentrations at the  equilibrium? You will determine the equilibrium  concentration of FeSCN +2   Experimentally [FeSCN 2+ ] [Fe 3+ ][ SCN - ] Keq = [Fe 3+ ] i, [SCN - ] i only
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6 Fe 3+ + SCN - FeSCN 2+ Determination of Equilibrium Constant What are the initial concentrations? How can we express the concentrations at the  equilibrium? You will determine the equilibrium  concentration of FeSCN 2+   Experimentally [FeSCN 2+ ] [Fe 3+ ][ SCN - ] Keq = X = [FeSCN 2+ ] [Fe 3+ ] i - X [SCN - ] i - X X
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7 Fe 3+ + SCN - FeSCN 2+ Establish Beer’s law plot (Calibration curve).  Determine eq. Conc. FeSCN +2  from plot. We will  need to: Determine operating  λ .
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8 A λ [FeSCN 2+ ] o o o o o Calibration Points Measured Absorbance of an Equilibrium Solution Ferricyanate Ion Concentration in the Solution Use of the Calibration Plot
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9 Safety Concerns: Safety Goggles are required to be worn at all times  while you are in the lab room even, when completing  calculations and writing up the lab. All solutions contain HNO3. Nitric Acid is corrosive to the skin, eyes, and  clothing.  Wear your safety goggles. Immediately  flush any area of skin or clothing that may have come  in contact with these solutions . Ferric Nitrate may stain some clothing. All FeSCN2+ waste produced in this exercise should  be discarded in appropriate waste containers located  in hoods.
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10 Chemical Equilibrium When compounds react, they eventually form a mixture of products and unreacted reactants, in a dynamic equilibrium. A dynamic equilibrium consists of a forward reaction, in which substances react to give products, and a reverse reaction, in which products react to give the original reactants. Chemical equilibrium is the state reached by a reaction mixture when the rates of the forward and reverse reactions have become equal .
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11 Chemical Equilibrium Much like water in a U-shaped tube, there is constant mixing back and forth through the lower portion of the tube. It’s as if the forward and
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Lecture 2_09_09A0 - Chapter 14 Chemical Equilibrium 1...

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