Download Reactions between Solutions

Name (LAST, First) _______________, _______________
Date: ___/___/______ Block 1 2 3 4 5 6 7 8
Reactions between Solutions
Experiment #16
Introduction
When a substance dissolves, its particles separate
from each other and are able to move freely
throughout the solution. If the solution is ionic,
then both cations and anions are free to move
independently. A solution such as KI(aq) will
consist of K+(aq) and I-(aq) ions moving
independently of each other within the liquid
phase.
If two different ionic solutions are mixed, new
ion combinations are possible. Some ions will
have minimal attraction for each other, and will
thus continue to move freely and independently
throughout the solution. In other cases, however,
a pair of ions will attract each other sufficiently
that they begin to stick together. A solid forms in
the midst of the liquid phase. We call this solid
formed in solution a precipitate (ppt).
Procedure
Using the grid sheet, systematically mix all
possible combinations of the following solutions:
lead(II) nitrate, sodium phosphate, potassium
iodide, copper(II) sulfate, sulfuric acid, sodium
hydroxide, silver nitrate, calcium chloride, nitric
acid, sodium carbonate, iron(III) nitrate, and
ammonium hydroxide. Record observations,
looking particularly for any evidence of chemical
change.
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Prelab Reading Assignment
§ 8.0 – 8.3
Table 8.1 / Figure 8.3 copied into Lab Manual.
Copy the Slip Sheet table into your Lab Manual.
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Prelab Questions
Define the following terms:
a. Precipitate
b. Clear, Colorless
c. C/C Dissociation & Decomposition
FQ(p223): 1 – 3
FQ(p230): 1 – 3
Self Check 8.1
Self Check 8.2
QP(8): 3, 6, 7, 8, 11ab, 12ab, 13ab, 14ab
Results
Write molecular equations for each
combination that reacts.
Compare your results to a Solubility Table.
For each possible combination, determine if
a reaction should have taken place. If no
reation should have occurred, write “NR” in
the empty cell representing that combination.
If a reaction should have taken place, write
the formula of the solid product in the
appropriate empty cell.
Postlab Questions
For each combination that the class
determines should have reacted, write a
complete ionic equation and a net ionic
equation.
Experimental Question
What may happen when the anions and cations
from different solutions come into contact with
each other?
Experiment Overview
A grid sheet inside a polypropylene sheet
protector is used as a surface on which to react
acids, bases and salts. Molecular equations are
written for those combinations that react.
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16-DR Reactions Slip Sheet
Name (LAST, First) _______________, _______________
Date: ___/___/______ Block 1 2 3 4 5 6 7 8
Place 1 – 2 drops of the correct column solution in the middle of each square.
Then place 1 – 2 drops of the correct row solution on top of the existing drop in each square.
Do not touch anything with the tip of the dropper, as solution contamination may result.
Pb(NO3)2
Na3PO4
KI
CuSO4
H2SO4
NaOH
AgNO3
CuCl2
HNO3
Na2CO3
Fe(NO3)3
NH4OH
Pb(NO3)2
Na3PO4
KI
CuSO4
H2SO4
NaOH
AgNO3
CuCl2
HNO3
Na2CO3
Fe(NO3)3
NH4OH
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When finished wipe clean with a damp paper towel. Dispose of towel in trash can.
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