Countertop Chemistry from The Science House
Experiment #11
Double Replacement Reactions
This experiment demonstrates reactions that occur between two aqueous
solutions. The driving force for the reaction is the formation of an insoluble
product.
Substitutions
Materials
0.1 M NaCl
C 0.1 M CuSO4
C 0.1 M AgNO3
C
0.1 M Na3PO4
C 0.1 M NaOH
C Spot plate
C Droppers (5)
C
watch glasses (6)
I
II
NaCl (aq)
CuSO4 (aq)
NaOH (aq)
CuSO4 (aq)
IV
NaCl (aq)
AgNO3 (aq)
V
NaOH (aq)
AgNO 3 (aq)
III
Na 3PO4 (aq)
CuSO 4 (aq)
VI
Na 3PO4 (aq)
AgNO 3 (aq)
Procedure
1. Number wells 1-6. Place 10 drops of NaCl solution in wells I and IV,
10 drops of NaOH in wells II and V, and 10 drops of Na3PO4 in wells
III and VI.
2. Using the diagram above, add 10 drops of CuSO4 to wells I, II, and
III and 10 drops of AgNO3 to wells IV, V, and VI.
3. Note any color changes or precipitate formation in the Data section.
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Countertop Chemistry from The Science House
Experiment #11
4. Write a balanced equation for the reactions that occur. Include
physical state symbols for the reactants and products. If no
precipitate occurred, NO REACTION occurred.
Data and Observations
Well
I.
Well
II.
Well
III.
Well
IV.
Well
V.
Well
VI.
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Countertop Chemistry from The Science House
Experiment #11
Teacher's Notes
I.
NaCl (aq) + CuSO4 (aq) -------> No Reaction.
II.
2NaOH (aq) + CuSO4 (aq) -------> Na2SO4 (aq) + Cu(OH)2 (s)
III.
Na3PO4 (aq) + CuSO4 (aq) -------> No Reaction
IV.
NaCl (aq) + AgNO3 (aq) -------> NaNO3 (aq) + AgCl (s)
V.
NaOH (aq) + AgNO3 (aq) -------> NaNO3 (aq) + AgOH (s)
VI. Na3PO4 (aq) + AgNO3 (aq) -------> 2NaNO3 (aq) + Ag3PO4 (s)
Disposal
All solids should be collected into a labeled waste solid container.
Aqueous solutions can be flushed down the drain in the quantities
suggested here.
This work by The Science House is licensed under a Creative Commons AttributionNonCommercial-ShareAlike 3.0 Unported License.
http://creativecommons.org/licenses/by-nc-sa/3.0/