Chemistry · A-Level · AQA · AQA A-level Chemistry - (7405) · Specification point · 3.1.6.2 · Physical chemistry · Chemical equilibria, Le Chatelier’s principle and Kc
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3.1.6.2 Equilibrium constant Kc for homogeneous systems
| Content | Opportunities for skills development |
|---|---|
The equilibrium constant is deduced from the equation for a reversible reaction. The concentration, in mol dm⁻³, of a species X involved in the expression for is represented by [X] |
The value of the equilibrium constant is not affected either by changes in concentration or addition of a catalyst.
Students should be able to:
construct an expression for for a homogeneous system in equilibrium
calculate a value for from the equilibrium concentrations for a homogeneous system at constant temperature
perform calculations involving
predict the qualitative effects of changes of temperature on the value of
MS 0.3 Students estimate the effect of changing experimental parameters on a measurable value, eg how the value of would change with temperature, given different specified conditions. MS 1.1 Students report calculations to an appropriate number of significant figures, given raw data quoted to varying numbers of significant figures. Students understand that calculated results can only be reported to the limits of the least accurate measurement. MS 2.2 and 2.3 Students calculate the concentration of a reagent at equilibrium. Students calculate the value of an equilibrium constant PS 2.3 Students could determine the equilibrium constant, , for the reaction of ethanol with ethanoic acid in the presence of a strong acid catalyst to ethyl ethanoate. |