In this PLE we are going to investigate the reaction

Fe3+(aq) + SCN-(aq) ---> FeSCN2+(aq)

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Give me some responses to the questions below and I'll give you some extra credit.


Laboratory Section:

1. Below is a figure showing beakers containing each of the three substance in this reaction.

Note the Fe3+(aq) in a light yellow, SCN-(aq) is essentially colorless and the FeSCN2+(aq) is a redish color. If I mix equal amounts of Fe3+(aq) and SCN-(aq) predict what you expect will happen. (Hint)

2. Suppose the amounts of Fe3+(aq) and SCN-(aq) in the original reactant beakers are about the same, say, 0.001 mol of each reactant were present in the reactant beakers. When the two are mixed reaction goes to completion. How many moles of Fe3+(aq) and SCN-(aq) would you expect are present after mixing the reactants?

3. Now I will pour half of the beaker containing the product mixture into another beaker, so I have two beakers with approximately equal amounts. When I add some additional Fe3+(aq) to the beaker (A) we see the result (B). Explain what you think has happened.

4. When I add some additional SCN-(aq) to the beaker (C) we see the result (D). Explain what you think has happened.

5. How would you explain B and D when (after separating into two containers A and B) adding additional reactant? What must be occuring when the two reactants were initially mixed?

6. Is there anything about the reaction or the questions that you feel you do not understand? List your concerns/questions.