Lecture 7--Stressing a System at Equilibrium

# Lecture 7--Stressing a System at Equilibrium - Stressing a...

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Stressing a System at Equilibrium Ch 302, Fall 2009 B. A. Rowland September 28, 2009

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Outline Thus far we have characterized chemical equilibrium and have sketched out the basic outline of how to handle equilibrium problems. In this lecture, I will teach you some mathematical techniques that may help you when solving these expressions. We’ll also discuss the qualitative and quantitative methods by which we can discuss stresses to systems that have achieved equilibrium.
Methods to Solve Equilibrium Calculations There are three methods that you can employ when computing reaction compositions at equilibrium: 1. If the expression ultimately results in a quadratic polynomial, you can employ the quadratic equation: 2. If the expression results in a perfect square, you can take the square root of both sides. 3. In all other systems, you can employ iteration . 2 2 4 , where the polynomial is in the form 0. 2 b b ac x ax bx c a - ± - = + + =

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Systems with Small Equilibrium Constants Most equilibrium calculations require some intense computation, however, there is a small class of problems for which a simplification can be made. If you start with reactants (products) only and the
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## This note was uploaded on 01/30/2010 for the course GOV 312L taught by Professor Madrid during the Fall '07 term at University of Texas.

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Lecture 7--Stressing a System at Equilibrium - Stressing a...

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