Chapter 13 Chemical Equilibrium

Chapter 13 Chemical Equilibrium - order to reach...

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Chapter 13 Chemical Equilibrium Equilibrium Position – a set of equilibrium concentrations. If the reactants are favored the equilibrium is said to lie to the left. If the products are favored the equilibrium it is said to lie to the right. Law of Mass Action – assume aA + bB Types of Equilibria Homogeneous Equilibrium – all reactants and products are in the same phase Hetermogeneous Equilibrium – reactants and products are in different phases, pure solids and liquids when the solvent, will not effect the equilibrium and are not included in the equilibrium expression Gas Phase Equilibria Usually use concentrations to define how much of each reactant or product there is, but can also use pressure Equilibrium Expressions Test is from 12-13.6 Reaction Quotient – (Q) determines which way a reaction needs to proceed in
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Unformatted text preview: order to reach equilibrium. Calculated the same way as K, just with initial, not equilibrium concentrations. o Q = K at equilibrium o Q > K needs to proceed to reactants o Q < K needs to proceed to products Steps for Solving Equilibrium Problems o Write the balance equation o Write the equilibrium expression using the law of mass action o List the initial concentrations o Calculate Q and determine the direction the reaction must proceed to reach equilibrium o Define the change and equilibrium concentrations o Substitute the equilibrium concentrations into the equilibrium expression and solve for the unknown o Check you calculated equilibrium concentrations by making sure they give the correct value of K...
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This note was uploaded on 02/09/2009 for the course CHEM 105BLG taught by Professor Parr during the Spring '08 term at USC.

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Chapter 13 Chemical Equilibrium - order to reach...

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