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The mass of solid
dissolved per cubic
centimeter of liquid is
called the __________
of the solution.
Show Answer
Answer for 5 Points
Concentration
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A dissolved solid is called
the _______.
Show Answer
Answer for 5 Points
Solute
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The volume of liquid in which a
solid is dissolved in is called
the ___________.
Show Answer
Answer for 5 Points
Solvent
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If you dissolve 25.0 g
3
sugar in 150 cm of
water, what is the
concentration in
3
g/100 cm ?
Show Answer
Answer for 5 Points
17 g/100 cm3
Back to Board
Which solution is
more concentrated,
3
2.5 g/cm or 2.6 g/10
3
cm ?
Show Answer
Answer for 5 Points
2.5 g/cm3 = 25 g/10 cm3.
The first solution is more
concentrated.
Back to Board
A student poured 60 g of sodium nitrate into
100 cm3 of water and observed that all of
the solid dissolved. Which of the following
can she conclude about the solubility of
sodium nitrate in water?
A. It is less than 60 g/100 cm3.
B. It is 60 g/100 cm3.
C. It is greater than 60 g/100 cm3.
Show Answer
Answer for 10 Points
C. It is greater than 60 g/100 cm3.
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Which of the following steps will increase
the concentration of a solution of salt and
water?
A. Allowing some of the water to
evaporate
B. Adding water to the solution
C. Adding salt to the solution
D. Pouring out some of the solution
Show Answer
Answer for 10 Points
A and C will increase the
concentration, but only if
the solution is not already
concentrated.
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Each of four test tubes contains 10 cm3 of water
at 25 °C. The following masses of unknown
solid are placed in the test tubes: 4 g in the first,
8 g in the second, 12 g in the third, and 16 g in
the fourth. After the tubes are shaken, all of the
solid has dissolved in the first two test tubes,
but some undissolved solid remains in the other
two tubes.
What is the concentration of the solid
in each of the first two tubes?
Show Answer
Answer for 10 Points
Concentration in the first tube:
40 g/100 cm3
Concentration in the second
tube:
80 g/100cm3
Back to Board
The solubility of the orange solid that you
dissolved in water in experiment 4.1 is shown
below for various temperatures. What would you
expect the solubility to be at 15 °C? Explain.
Temperature (°C)
Solubility (g/100 cm3)
10
20
30
6.6
12.2
18.0
Show Answer
Answer for 10 Points
A good way to answer this
is to make a graph using
the 3 data points. The
solubility at 15 °C is about
9.4 g/100cm3
Back to Board
The solubility of the orange solid that you
dissolved in water in experiment 4.1 is shown
below for various temperatures. What would
you expect the solubility to be at 40 °C?
Explain.
Temperature (°C)
Solubility (g/100 cm3)
10
20
30
6.6
12.2
18.0
Show Answer
Answer for 10 Points
A good way to answer
this is to make a graph
using the 3 data points.
The solubility at 40 °C is
about 23.8 g/100cm3
Back to Board
If you dissolve 25.0 g of sugar in 150 cm3
of water, what is the concentration in
g/cm3?
Show Answer
Answer for 15 Points
25.0/150 = 0.17 g/cm3
Back to Board
There are two kinds of felt-tip
(magic markers) pens. Some are
labeled “permanent” and some are
labeled “water color”.
What does the label tell
you about the solubility in
water of the dye in the two
inks?
Show Answer
Answer for 15 Points
The label suggests that the
dye in the “permanent” ink is
insoluble in water, unlike the
dye in the “water color”.
Back to Board
A solid is placed in a container with
water and stirred thoroughly. Some
solid dissolves and some solid
remains at the bottom of the
container.
Will adding more water and stirring
cause more of the solid to
dissolve?
Show Answer
Answer for 15 Points
Yes, if more water is present,
more solid can be
dissolved
Back to Board
If you dissolve 25.0 g of
sugar in 150 cm3 of water,
what is the concentration in
3
g/10 cm ?
Show Answer
Answer for 15 Points
1.7 g/10 cm3
Back to Board
A solid is placed in a container with
water and stirred thoroughly.
Some solid dissolves and some
solid remains at the bottom of the
container.
Does adding more water
increase the solubility of the
solid?
Show Answer
Answer for 15 Points
No, the solubility of the solid in
water is not affected, only the
amount of the solid that can be
dissolved.
Back to Board
At what
temperature
are the
solubilities of
potassium
nitrate and
sodium chloride
equal?
Show Answer
Answer for 20 Points
The solubilities are equal at 24 C,
the point where the graphs for the
two substances cross.
Back to Board
What mass of
sodium chloride
(in grams) can
be dissolved in
100 cm3 of
water at 20 °C?
Show Answer
Answer for 20 Points
36 g at 20 °C
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What mass of
sodium chloride
(in grams) can be
dissolved in 100
cm3 of water at
100 °C?
Show Answer
Answer for 20 Points
40 g at 100 °C
Back to Board
What temperature
is required to
dissolve 110 g of
sodium nitrate in
100 cm3 of
water?
Show Answer
Answer for 20 Points
47 °C
Back to Board
A mass of 30 g of
potassium nitrate is
dissolved in 100cm3
of water at 20 °C.
The solution is
heated to 100 °C.
How many more
grams of potassium
nitrate must be
added to saturate
the solution?
Show Answer
Answer for 20 Points
242 g - 30 g =212
Back to Board
A mass of 10 g of
sodium nitrate is
dissolved in 10 cm3
of water 80 °C. As
the solution is
cooled, at what
temperature will
precipitate first
appear?
Show Answer
Answer for 25 Points
Ten grams of sodium nitrate dissolved
in 10 cm3 of water is equivalent to 100
g dissolved in 100 cm3 of water. The
figure shows that as the solution cools,
it will be saturated at 37 °C, and a
precipitate will begin to form.
Back to Board
What is the name given
to a combination of a
solvent and a solute
that cannot be
separated by
filtration?
Show Answer
Answer for 25 Points
Solution
Back to Board
From the table below it can
correctly be concluded that
which of the following
substances may be the same?
Solid
Liquid A Liquid B Liquid C
X
Soluble Soluble insoluble
Y
insoluble
Soluble Soluble
Show Answer
Answer for 25 Points
None are the same
Back to Board
What is another term for
weak solutions?
Show Answer
Answer for 25 Points
Dilute solutions
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Jorge dissolves as much as he can
of a certain solid in 10 cm3 of
water in a beaker. The solid has a
solubility of 80g/100cm3 of
water. The solution is then
allowed to evaporate until only
5cm3 of liquid remains. If he then
decants the solution and
evaporates it to dryness how
much of the solid will Jorge be
able to retrieve?
Show Answer
Answer for 25 Points
4g
80/100 x 5 =4
Back to Board
Authored by
Jeff Ertzberger - 2004
University of North Carolina at Wilmington
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