Write the Kc Expression for the Lab’s Reaction Background: The purpose of this lab is to experimentally determine the equilibrium constant, Kc, for the following chemical reaction: Fe3+(aq) + SCN–(aq) FeSCN2+(aq) iron(III) thiocyanate thiocyanoiron(III)
Write the Kc Expression for the Lab’s Reaction
Background:
The purpose of this lab is to experimentally determine the equilibrium constant, Kc, for the following
Fe3+(aq) + SCN–(aq) FeSCN2+(aq)
iron(III) thiocyanate thiocyanoiron(III)
When Fe3+ and SCN- are combined, equilibrium is established between these two ions and the FeSCN2+ ion. In order to calculate Kc for the reaction, it is necessary to know the concentrations of all ions at equilibrium: [FeSCN2+]eq, [SCN–]eq, and [Fe3+]eq. You will prepare four equilibrium systems containing different concentrations of these three ions. The equilibrium concentrations of the three ions will then be experimentally determined. These values will be substituted into the equilibrium constant expression to see if Kc is indeed constant.
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