Ice table chemistry calculator6/22/2023 ![]() ![]() Sometimes you will have to calculate the equilibrium concentrations in a reaction before calculating the value of Kc. Therefore the units cancel out therefore there are no units for Kc in this example. Finally calculate the units of the value for Kc by just substituting the equation with the units without putting the numbers in. Substitute the molar equilibrium concentrations into the equation and calculate the value of Kc.ģ. Write an expression for Kc using the reversible reaction equation.Ģ. H2 (g) + Cl2 (g) ⇌ 2HCl (g)? The equilibrium concentrations are: = 0.67 mol dm–3, = 0.33 mol dm–3.ġ. Practice Question: What is the value for Kc of the reaction with the equation: ![]() You will need to work out the units yourself as these will vary per calculation. If you know the values of the molar concentration of each of the substances at equilibrium, you can calculate the value of Kc by substituting the concentrations into the expression above. Kc Calculations Calculating a Value for the Equilibrium Constant Kc For a reaction involving liquids and gases, you cannot calculate Kc, but instead calculate Kp (which we will learn about in later chapters).For a reaction involving solids and liquids, you can calculate Kc, but ignore the concentration of solids.For a reaction involving solids and gases, you can calculate Kc, but ignore the concentration of solids.If you have a heterogenous mixture, you can still find out the equilibriumconstant: Heterogenous reactions involve reactants and products in different phases – e.g. they are all in solution, or are all gaseous. Homogenous reactions involve reactants and products which are in the same phase – e.g. The equilibrium constant is only for homogenous reactions. The magnitude of Kc can be used to estimate the position of equilibrium in a reaction: Calculations with Equilibrium Constants The equilibrium constant, Kc can be deduced for a reversible reaction by using the following expression: Calculations with Equilibrium Constants ![]() We can calculate the equilibrium concentration by finding the equilibrium constant, which is the ratio of the concentration of products to the concentration of reactants. These concentrations are called the equilibrium concentrations. Calculations with Equilibrium Constants (A-Level Chemistry) Equilibrium Constant The Equilibrium Constant KcĪfter a while of a reversible reaction being underway, a state of equilibrium is reached, with the concentrations of reactants (A and B) and products (C and D) changing not much thereafter. ![]()
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