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Le Chatelier's principle and sulfuric acid

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For the following reaction HSO4-(aq) + H2O <-> H3O+(aq) + SO42-

A.) How will the equilibrium change when Na2SO4 is added?

B.) How will the equilibrium change when NaHSO4 is added?

C.) Is this reaction endothermic or exothermic?

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Some good background material for La Chatelier's Principle is at this url: http://en.wikipedia.org/wiki/Henry_Louis_Le_Chatelier . At equilibrium the
rate of reactions is the same in both directions. When you add reagents
the concentration of reactants for one side of the reaction may increase.
That half of the reaction will also increase driving the reaction.

For this particular reaction the following things are important.
HSO4-(aq) + H2O(I) <-> H3O+(aq) + SO42-

A.) If you add NaSO4 to the reaction it will dissociate in this reaction

Na2SO4 -> 2Na+ + SO42-

It is a neutral salt (see http://en.wikipedia.org/wiki/Sodium_sulfate for
properties of Sodium sulfate.

If SO42- is added to your equilibrium then the concentration of reactants
on the ...

Solution Summary

How is the reaction of sulfuric acid affected by addition of salts or heat?

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Le Chateliers Principle

I already know what Le Chatliers Principle is, but I need help describing what is going on in specific in the following reactions. For example, how is the chemical equation changing to minimize change.

1. Bromine water is initially yellow/brown but changes to yellow when sodium hydroxide is added. Then when sulfuric acid is added the solution turns yellow/brown again.
What is happening? Note: Br2(aq) + H2O(l) <----> HOBr2(aq) + Br2 -(aq) + H+

2. Potassium chromate is initially yellow. When sulfuric acid is added the solution turns orange. Then when sodium hydroxide is added the solution turned back yellow.
What is happening? Note: CrO4 2-(aq) + 2H+(aq) <-----> Cr2O7 2-(aq) + H2O(aq)

3. Ethyl acetoacetate and water are clear initially, then when iron(III) chloride is added the solution turned deep purple. Then when bromine water was added the solution turned clear. Over time the deep purple color reappeared in the solution.
What is happening? Note: Ethyl acetate exists as an equilibrium mixture of two forms(called tautomers) -when iron(III) chloride is added to ethylaccetoacetate the solution becomes coloured because of a reaction between the enol form and the iron(III) chloride. The enol form of ethylacetoacetate also reacts with bromine water.

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