UNT CHEM 1415 - Equilibrium Concentrations (3 pages)

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Equilibrium Concentrations



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Equilibrium Concentrations

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Additional example for examining equilibrium concentrations and introduction to LeChatelier's Principle and how changing temperature, concentration, pressure effect the Equilibrium.


Lecture number:
17
Pages:
3
Type:
Lecture Note
School:
University of North Texas
Course:
Chem 1415 - Gen Chem Engineers
Edition:
1

Unformatted text preview:

CHEM 1415 1st Edition Lecture 17 Unit Equilibrium Concentration Outline of Current Lecture I Equilibrium Concentrations a Example 1 II LeChatelier s Principle a Effects of a Change in Concentration b Effects of a Change in Pressure c Effects of a Change in Temperature d Effects of a Catalyst Current Lecture Equilibrium Concentrations o Strategies to solve equilibrium concentration problems Write a balanced chemical equation for the relevant equilibrium or equilibria Write the corresponding equilibrium expression Create a table of concentrations for all of the reacting species o Example 1 Phosphorus trichloride reacts with Chlorine gas to form phosphorus pentachloride at k 33 T 250 0 050 M of PC l 3 and 0 015 M of Cl2 What are the equilibrium concentrations Cl2 g PCl3 g PCl5 g 2 PCl5 K 33 Cl2 PC l3 Cl2 PCl3 PCl5 Initial Concentration 0 015 M 0 050 M 0M Change in Concentration x x x Final 0 015 x 1 50 x x These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Concentration PCl 5 x 33 59 3 0 050 x 0 015 x Cl 2 PC l 3 K 2 33 x 3 145 x 0 025 0 x 0 087 0 0088 Therefore PCl5 x 0 0088 M C l2 0 015 x 0 015 0 0088 006 M PC I 3 0 05 x 0 050 0 0088 0 042 M LeChatelier s Principle o When a system at equilibrium is stressed it responds by reestablishing equilibrium to reduce the applied stress o Effects of a Change in Concentration by considering the reaction quotient Q with the equilibrium constant K Type of Concentration Change Resulting Change in Q Response of System Products increased Q K More reactants formed Products decreased Q K More products formed Reactants increased Q K More products formed Reactants decreased Q K More reactants formed o Effects of a change in Pressure on Equilibrium If number of moles of gases differs between reactants and products a shift in pressure will result in a change in the equilibrium position o Effects of change in temperature on equilibrium o



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