SOLUBILITY WORKSHEET #1
NAME: ________________________________________ 8:____
1. In a high school chemistry class, students investigated the solubility of alum and
obtained the data shown in the table below. Use this data to plot a solubility graph
for alum below.
SOLUBILITY OF ALUM IN 100 mL OF WATER
TEMPERATURE (ºC)
ALUM (g)
0
5
10
7
20
10
30
14
40
22
50
30
60
47
a. What is the manipulated variable? _______________________________
b. What axis would the manipulated variable go on? ______________
c. What is the responding variable? __________________________
d. What axis would the responding variable go on? _______________
e. The temperature range is from ______ to ______, so the intervals on the graph
would be ________.
f. What is the range of grams of Alum dissolved? ______ to ____ You would start at
________ and use intervals of ______.
2. Answer the following questions by using the graph from question #1.
a. If you wanted to dissolve 25g of Alum in 100mL of water, how hot must the water
be? _______ºC.
b. How much Alum will dissolve in 100mL of water at 15ºC? _______g
c. Extend the curve of your graph to higher temperatures. Predict how much Alum
would dissolve in 100mL of water at 70ºC? _________g
3. Examine the data for the solubility of table salt (Sodium Chloride) in Table 1-2. Plot
this data on the graph in question #1, using a different color or type of line.
TABLE 1-2
SOLUBILITY OF TABLE SALT IN 100mL OF WATER
TEMPERATURE
TABLE SALT (g)
0
35.7
10
35.8
20
36.0
30
36.2
40
36.5
50
36.7
60
37.3
a. At 20ºC which solution contains the most solute? Salt or Alum
___________________________________________
b. At 60ºC which solution contains the most solute? Salt or Alum
c. For which substance, Salt or Alum, is solubility more affected by a change in
temperature?
d. If you had 35g of salt at 40ºC would the solution be unsaturated or saturated?
e. If you had 35g of Alum at 40ºC would the
solution be unsaturated, saturated?
4.
On the graph below use a light blue pencil
crayon to color the area where solutions of X
and Y are both unsaturated.
5. On the graph below use a light green pencil
crayon to color the area where solutions of X
are saturated while solutions of Y are still
unsaturated.
SOLUBILITY WORKSHEET #2
NAME: _________________________8___
1. Examine the solubility of the substances in graph below and answer the following
questions.
a. What is the solubility of KNO3 at 40ºC? ____________
b. What is the solubility of KNO3 at 20ºC? ____________
c. If you increased the temperature from 40 ºC to 50 ºC, how much more solute
would you need to add to make a saturated solution? ______g
d. Which substance is least soluble (requires the lowest amount of solute to saturate
the solution) at 20ºC? ________
e. Which substance is saturated at 40ºC with 78g of solute? ___________
f. How many grams of NaClO3 is needed to make a saturated solution at 25ºC? ___g
g. If you had 100g of each substance at 80ºC, which substance(s) would not be
saturated? ________________________________________________________
h. What two substances have the same saturation point at 48ºC?
_____________________________________________________________________
i. If you had 100g of KBr at what temperature would it be saturated? _______ ºC
2. In general, the graph of CO2 solubility in water shows
that as the temperature increases the amount of solute
being dissolved in water _______________________. CO2
is a gas, so as temperature increases the solubility of a
gas ______________________(thermal pollution).
3. Answer the following questions based on the graph below.
a. What substance changes the least in solubility across the entire temperature range?
b. How many grams of potassium iodide will dissolve at 30°C? ________g
c. At what temperature will 20 grams of potassium chlorate dissolve in water?_____ °C
d. How many grams of
sodium nitrate will
dissolve at 90°C?
________g
e. At approximately
what temperature will
85 grams of
potassium nitrate
dissolve in water?
________°C
f. What substance
dissolves best at the
freezing point of water
(0°C )?
____________________
g. Based on your
knowledge of how
heat energy affects
particle spacing and
movement, why would
more solute dissolve
in a solvent at higher
temperatures?