Chapter 7 Solutions And Colloids Worksheet With Answers Page 3
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33Solutions and Colloids 145
c. 25 mL of chloroform and 1 g of roofing tar – the resulting mixture is
clear but dark brown in color
soluble
7.7
Miscible is a term used to describe liquids have unlimited solubility in each other.
7.8
a. A solution to which a small piece of solute is added, and it dissolves. unsaturated
b. A solution to which a small piece of solute is added, and much more
solute comes out of solution.
supersaturated
c. The final solution resulting from the process in part (b).
saturated
7.9
If 35.8 g of ammonium sulfate were mixed with 100 g of water at 0°C, an unsaturated solution
would form because the solubility of ammonium sulfate with 100 g of water at 0°C is 70.6 g.
7.10
This solution could become supersaturated by slowly lowering the temperature of the
solution or by allowing some of the solvent to evaporate. The solution must be handled very
gently as a supersaturated solution is unstable.
7.11
a. boric acid, H
BO
(6.35 g at 30°C)
soluble
3
3
b. calcium hydroxide, Ca(OH)
(5.35 g at 30°C)
soluble
2
c. antimony(III) sulfide, Sb
S
(1.75 x 10
g at 18°C)
insoluble
‐4
2
3
d. copper(II) chloride, CuCl
(70.6 g at 0°C)
very soluble
2
e. iron(II) bromide, FeBr
(109 g at 10°C)
very soluble
2
7.12
a. barium nitrate, Ba(NO
)
(8.7 g at 20°C)
soluble
3
2
b. aluminum oxide, Al
O
(9.8 x 10
g at 29°C)
insoluble
‐5
2
3
c. calcium sulfate, CaSO
(0.21 g at 30°C)
slightly soluble
4
d. manganese chloride, MnCl
(72.3 g at 25°C)
very soluble
2
e. lead bromide, PbBr
(0.46 g at 0°C)
slightly soluble
2
THE SOLUTION PROCESS (SECTION 7.3)
7.13
The hydrated ion is surrounded by water molecules. For the Cl
‐
ion, the hydrogen atoms in
the water molecule will be oriented toward the Cl
‐
ion. A nonhydrated ion is not surrounded
by water molecules. See Figure 7.4 in the text for an example of what the sketch should look
like.
7.14
I would add water to the sample, stir the mixture, and filter out the solid from the
heterogeneous mixture. The barium sulfate is insoluble in water and would be the solid
(residue) from the filtration of the heterogeneous mixture. Barium chloride is very soluble
and would dissolve in the water.
7.15
Ground‐up limestone (CaCO
) is a better choice as a gentle abrasive in some powdered
3
cleansers than ground‐up soda ash (Na
CO
) because CaCO
is not soluble in water, while
2
3
3
Na
CO
is soluble in water. That means that the CaCO
can act like an abrasive in a paste,
2
3
3
while the Na
CO
cannot.
2
3
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