AP Chemistry - Semester 2: Equilibrium: the extent of Chemical Reactions
Sections: Introduction   |  Section 1   |  Section 2   |  Section 3   |  Section 4   |  Section 5   |   lab Lab
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Lab Assignment: Equilibrium Constant

Background

The equilibrium constant is the ratio of the product of the reaction products over the product of the reactants.  For the reaction aA + bB  ↔  xX + yY it is expressed as

Kc = {[A]^a [B]^b} / {[X]^x [Y]^y}

This value is constant for a reaction at a constant temperature and can be determined by using the equilibrium concentrations.
(Note that each concentration is raised to the coefficient next to it.  This is because you are taking the products of all the concentration. When two of the same concentrations are multiplied, it is the same as squaring the concentration.)

As you go through this lab, you will be finding the concentration of the product at equilibrium and calculating the concentrations of the reactants using the initial concentration of one of them to determine their equilibrium concentration.  Follow the instructions in the special section to see what equations to use to find the needed concentrations.

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