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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
Back to Board
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 sugar in 150 cm3 of water, what is the concentration in
g/100 cm3?Show Answer
Answer for 5 Points
17 g/100 cm3
Back to Board
Show Answer
Which solution is more concentrated,
2.5 g/cm3 or 2.6 g/10 cm3?
Answer for 5 Points
2.5 g/cm3 = 25 g/10 cm3. The first solution is more
concentrated.
Back to Board
Show Answer
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.
Answer for 10 Points
C. It is greater than 60 g/100 cm3.
Back to Board
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.
Back to Board
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.
Show Answer
Temperature (°C) Solubility (g/100 cm3)
102030
6.612.218.0
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
Show Answer
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)
102030
6.612.218.0
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
Show Answer
If you dissolve 25.0 g of sugar in 150 cm3 of water, what is the concentration in
g/cm3?
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
Show Answer
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?
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
g/10 cm3?
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
Show Answer
At what temperature
are the solubilities of
potassium nitrate and
sodium chloride equal?
Answer for 20 Points
The solubilities are equal at 24 C, the point where the graphs for the
two substances cross.
Back to Board
Show Answer
What mass of sodium chloride (in grams) can be dissolved in
100 cm3 of water at 20 °C?
Answer for 20 Points
36 g at 20 °C
Back to Board
Show Answer
What mass of sodium chloride
(in grams) can be dissolved in 100 cm3 of water at
100 °C?
Answer for 20 Points
40 g at 100 °C
Back to Board
Show Answer
What temperature is required to
dissolve 110 g of sodium nitrate in
100 cm3 of water?
Answer for 20 Points
47 °C
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Show Answer
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?
Answer for 20 Points
242 g - 30 g =212
Back to Board
Show Answer
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?
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
Show Answer
What is the name given to a combination of a solvent and a solute that cannot
be separated by filtration?
Answer for 25 Points
Solution
Back to Board
Show Answer
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
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
Back to Board
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
4 g
80/100 x 5 =4Back to Board
End It
Authored byJeff Ertzberger - 2004
University of North Carolina at WilmingtonAll rights reserved.
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