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Revision notes on chemical equilibrium - concentration equilibrium expression/constant (Kc) calculations for Advanced Level Theoretical-Physical Chemistry
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Doc Brown's Chemistry Advanced A Level Notes - TheoreticalPhysical Advanced Level Chemistry Equilibria Chemical Equilibrium Revision Notes PART 2
2b. Kc chemical equilibrium expression, Kc
equilibrium constant and Kc equilibrium calculations
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How do we write out Kc chemical equilibrium expressions. What is the Kc equilibrium constant? How do you do Kc equilibrium calculations using concentrations? All is explained with examples including the units for concentrations (mol dm3) and how to solve equilibrium problems using concentration units. The equilibrium constant Kc is deduced from the equation for a reversible reaction, NOT experimental data as for rate expressions in kinetics. The concentration, in mol dm-3, of a species X involved in the expression for Kc is represented by in square brackets i.e. [X] The value of the equilibrium constant is not affected either by changes in concentration or addition of a catalyst. You need to be able to construct an expression for Kc for a homogeneous system in equilibrium, calculate a value for Kc from the equilibrium concentrations for a homogeneous system at constant temperature, perform calculations involving Kc and predict the qualitative effects of changes of temperature on the value of Kc. How to write equilibrium expressions and work out the units of K, the equilibrium constant
Some 'VERY rough rules of thumb' for an equilibrium K value and the 'position' of the equilibrium in terms of LHS (e.g. original reactants or products of backward reaction) and the RHS (products of the forward reaction):
2b Exemplar calculations and concept Questions
2.2a Kc and concentration calculations
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