Solubility And Precipitation Worksheet
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1
2Teacher’s Edition
Solubility and Precipitation
Topical Unit of Instruction: Solutions and Solubility
Introduction
Materials
This microscale lab uses extremely small quantities of dilute solutions of
(For a class of 32 students working
mostly non-toxic chemicals. It generates two drops for each of the fifteen
in pairs)
combinations, only 30 drops of waste in all!
10 mL of each of the following
0.1 M solutions: AgNO
,
3
Time
NaNO
, Na
PO
, K
CO
,
3
3
4
2
3
FeCl
, and CuSO
.
3
4
30 minutes for data collection
16 well plates
50 minutes for analysis and conclusions
24 Beral pipets
Objectives
1. To observe precipitate formation in double replacement reactions.
2. To predict products of double replacement reactions using a solubility
chart and to write balanced equations for those reactions.
Preparation
1. To make 100 mL of each solution, put ~50 mL distilled H
O in each of six
2
100 mL volumetric flasks. Add the solutes as follows:
AgNO
: 1.70 g
3
NaNO
: 0.85 g
3
Na
PO
• 12 H
O : 3.80 g
3
4
2
K
CO
: 1.38 g
2
3
FeCl
• 6H
O : 2.70 g
3
2
CuSO
• 5H
O : 2.50 g
4
2
Swirl until dissolved and dilute to volume with distilled H
O.
2
2. Dispense the solutions in 4 sets of labeled Beral pipets.
Typical Results
AgNO
NaNO
Na
PO
K
CO
FeCl
3
3
3
4
2
3
3
CuSO
White PPT
(1)
NR
(2)
Turquoise PPT
(3)
Turquoise PPT
(4)
Yellow PPT
(5)
4
FeCl
White PPT
(6)
NR
(7)
White PPT
(8)
Orange PPT
(9)
3
K
CO
White PPT
(10)
NR
(11)
NR
(12)
2
3
Na
PO
Yellow PPT
(13)
NR
(14)
3
4
NaNO
)
NR
(15
3
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