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Unformatted text preview: ndition is established.
Consequently, the amount of oxygen decreases, the
amounts of nitrogen and water vapor increase, and the equilibrium s hifts to the right or favors the products .
If nitrogen were added to the equilibrium in equation 3
4 NH3(g) + 3 O2(g) 2 N2(g) + 6 H2O(g)
, the result would be exactly the opposite and there would be a s hift to the le ft to favor the re actants .
Another way of inducing a stress on such a system is to remove a reactant or product; the system responds by
replacing some of the substance that was removed.
In this experiment, two equilibrium systems will be
examined. Both are easy to study because they involve color changes. The first is the reaction between the
iron(III) ion (Fe3+) and the thiocyanate anion (SCN1-). These ions form the red complex cation* ferrithiocyanate
(FeSCN2+) according to equation 4.
Fe3+ + SCN− FeSCN2+ colorless red The other equilibrium involves two complex ions of cobalt:
CoCl42− + 6 H2O Co(H2O)62+ + 4 Cl− blue pink The CoCl42- ion is an intense blue, the color of the...
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This document was uploaded on 01/22/2014.
- Spring '14