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the aqueous form are included.
The equilibrium constant expression is the ratio of the concentrations of a reaction at equilibrium.
Each equilibrium constant expression has a constant value known as K,
the equilibrium constant. When dealing with partial pressures, Kp is used, whereas when dealing with concentrations (molarity), Kc
is employed as the equilibrium constant. Reactions containing
pure solids and liquids results in heterogeneous reactions in which the
concentrations of the solids and liquids are not considered when writing
out the equilibrium constant expressions.
We are going to look at a general case with the equation:
state symbols have been given, but they will be all (g), or all (l), or
all (aq) if the reaction was between substances in solution in water.
If you allow this reaction to reach equilibrium and then measure the
equilibrium concentrations of everything, you can combine these
concentrations into an expression known as an equilibrium constant.
The equilibrium constant always has
the same value (provided you do not change the temperature),
irrespective of the amounts of A, B, C and D you started with. It is
also unaffected by a change in pressure or whether or not you are using a
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Jun 25th, 2015
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