The two petri dishes contain approximately equal amounts of the original
mixture prepared by mixing the Fe3+(aq) and SCN-(aq)
solutions. We identified the product of the reaction FeSCN2+(aq).
When we add Fe3+(aq) to the solution in the petri
dish on the left we observe the solution gets darker. This is very interesting.
Adding some Fe3+(aq) causes the solution to get
darker, it appears that adding the Fe3+(aq) causes
more FeSCN2+(aq) to be formed.
We could understand this to suggest that in the solution in the petri
dish on the left there must have been some SCN-(aq). So
when I added Fe3+(aq) there was a reaction to produce
more of the product, FeSCN2+(aq).
So the original beaker containing the solution of FeSCN2+(aq)
must also have some SCN-(aq) present.
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