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Precipitation Reactions

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Rachel Esquibel

on 2 February 2016

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Transcript of Precipitation Reactions

Precipitation Reactions
A reaction that forms a solid when two aqueous solutions are formed. This solid is called a Precipitate.
Precipitation Reactions
Double Displacement Reaction

AB + CD --> AD + CB

when two ionic compounds react their ions separate and replace each other.
the ions that are not involved in the reaction and therefore undergo no changes are called spectator ions
Isolating the Precipitate
Precipitation Reactions
Table of Contents
Date Lecture/Activity Pg#
Uses of Precipitation Reactions
Occur at a very fast rates that allow for use in identifying specific ions based on precipitates that are formed

Precipitation reactions have a number of other uses:

production of colored pigments for paints and dyes
removal of toxic chemicals from water
separation of reaction products
How to write Precipitation Reactions
Step 1: Identify the reactants
Step 2: Split the each reactant into its positive and negative ions.
Step 3: Identify the possible products of the reactants by swapping the positive and negative ions of the reactants.
Step 4: Write the equation and balance it so that equal numbers of all atoms occur on both sides.
Step 5: Use your solubility rules to determine the precipitate that is formed
Ionic & Net Ionic Equations
Pb(NO3)2 (aq) + 2NaI (aq) --> 2NaNO3 (aq) + PbI2 (s)


Ionic Equations: all strong electrolytes are shown as ions

Pb+2 + NO3-1 + 2Na+1 + 2I-1 -->2 Na+1 + 2NO3 + PbI2

Net Ionic Equation: show only those ions that undergo a change; no spectator ions

Pb+2 (aq) + 2I-1 (aq) --> PbI2 (s)
02/05/16 Precipitation Reaction
Objective:
Today I will use the solubility rules so that I can predict reactions that will produce a precipitate.

Agenda:
Precipitation Reactions- Lecture
Precipitation Reaction Activity

Chemcatalyst:
Predict the products for the following reactions:
a. Na + Cl2 -->
b. BaCl + MgO -->
c. Al + Fe2O3 -->

The precipitate from a precipitation reaction can be separated from the reaction mixture by filtration.
A Buchner funnel and flask can be used to accelerate the process.
This apparatus uses a vacuum pump to draw the mixture through the filter.
The filtrate is finally washed and dried.

Identification of Silver
Halide precipitates
Coloration of the precipitate can allow identification of the halide involved
Full transcript