Experiment 39: Determination of Iron by Redox Titration Questions I. For what pu

Question

Experiment 39: Determination of Iron by Redox Titration Questions I. For what purpose was sulfuric acid added to the iron to the iron samples before titrating? 2. Typically, a solid analysis (the unknowns used in this experiment determined be afected y, a solid iron unknown for titration is dried in an oven to remove adsorbed water before were dred before dispensing). How would the % Fe if the unknowns had not been dried and had contained adsorbed water? 3. Potassium permanganate solutions can be used directly in the titration of samples containing iron in the 2+ oxidation state. Consult a textbook of analytical chemistry or a chemical encyclopedia to find nwo other methods for the determination of iron in unknown samples, and describe those methods here.

Explanation / Answer

1. Sulfuric acid is H2SO4. Iron is Fe.Because iron is a more active metal than hydrogen, it can displace hydrogen from the sulfuric acid.
Fe (s) + H2SO4 (aq)--> FeSO4 (aq) + H2 (g)

I assume you are dealing with redox reactions. A lot of reactions that undergo an oxidation or a reduction, only do so in either a basic solution or in the presence of H+ ions.

So, the reaction you are working with, needs H+ ions to go in the forward direction. And since sulfuric acid is a strong acid, you can add it and it will completely dissociate, adding H+ ions into solution and allowing the iron to be oxidized (I assume).

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