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Precipitation Reactions

When 2 reactants are mixed, an insoluble compound may form. This insoluble solid compound is called a precipitate. The production of a precipitate is considered a reaction.

How do we determine if a reaction occurs?

 

1. Write names of products by switching last names

2. Check solubility on table F.

         soluble --> (aq)

        insoluble--> (s)= precipitate = means a reaction occurs

      2 soluble products = no reaction=STOP

***Note...If Both products are soluble and all ions remain independent in solution; no reaction occurs like in this example:

Na+(aq) + Cl-(aq) + K+(aq) + NO3-(aq)

Names Examples

1. Write names of products by switching last names

2. Check solubility on table F.  (insoluble= solid, soluble=aqueous)

A. silver nitrate (aq)+ potassium chromate(aq)  potassium nitrate(aq) + silver chromate(s)

B. sodium sulfate(aq) + barium chloride(aq) barium sulfate(s) + sodium chloride(aq)

C. lithium hydroxide(aq) + sodium chromate(aq) sodium hydroxide(aq) + lithium chromate(aq)

C has no reaction, both products are soluble

 

on to Writing Reactions given Names(Molecular, Ionic and Net Ionic)

Writing Reactions given Formulas (Molecular, Ionic and Net Ionic)

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