Answer the following questions based
on the solubility curve below.
Which salt is least soluble in water ..
at 2O° C?
2. How many grams of potassium
chloride can be dissolved in 200 g
of water at 80° C?
3. At 40° C, how much potassium
_ __nitrate coin be dissoiu$tl ^n 30D.g of
...- O --60
4. Which salt shows the least change
In solubility from 0° - 100° C?
At 30° C, 90 g of sodium nitrate Is
20 30 40 50 60 70 80 90 100
Temperature (0 °C)
dissolved in 100 g of water. Is this
solution saturated , unsaturated or
6. A saturated-solution-of-potassium chlorate is formed from one hundred grams of water. If the saturated solution is cooled from 80° C to 50° C, how many grams of precipitate are formed?
- -0 'I
7. What compound shows a decrease in solubility from 0° to 100° C? 8. Which salt is most soluble at 10° C?
9. Which salt is least soluble at 50° C?
Which salt is least soluble at 90° C?
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CHAPTER 16 REVIEW ACTIVITY
Class Text Reference : Section 16-9
Study the solubility curves in the figure , and then
answer the questions that follow.
1. What relationship exists between solubility
and temperature for most of the substances
2. a. What is the exception?
NN t i
b. What general principle accounts for this ex6
3. a. Approximately how many grams of NaNO3
will dissolve in 100 g of water at 20°C?
b. How many grams will dissolve at 60°C?
L How many grams of NHgC1 will dissolve in
1 dam'- of H2O at 50°C?
5. Ninety grams of NaNO3 is added to 100 g of H2O
at 0°C. With constant stirring, to what temperature
C must the solution be raised to produce a saturated
solution with no solid NaNO3 remaining?
6. A saturated solution of KC103 was made with
300 g of H2O at 40°C. How much KCIOa could be
recovered by evaporating the solution to dryness?
7. Five hundred grams of water is used to make a
^saturated solution of KCI at 10°C. How many more
grams of KCI could be dissolved if the tem„ perature were raised to 100°C? 8. A saturated solution of KNO3 in 200 g of H2O at
50°C is cooled to 20°C. How much KNO3 will precipitate out of solution?
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CHEMISTRY: The Study of Matter
' Solubility Calculations
1. Calculate the maximum number of grams of each solute that can be dissolved; b) sodium chloride in 1250 um3
c) sodium nitrate in 50 crag
a) potassium nitrate in 300 cm3
of water at 400 C.
of water at 0° C.
of water at 80° C.
2. Calculate the minimum volume of water needed to dissolve; b) 10.0 g of potassium nitrate
a) 500 g of sodium chloride
in water at 0° C.
in water at 100° C.
c) 1.00 kg of sodium nitrate
in water at 50° C.
3. Calculate the temperature the water must be to just dissolve;
a) 80.0 g of potassium nitrate
in 200 cm3 of water.
b) 60.0 g of potassium nitrate
in 50 cm3 of water.
4. Calculate the mass of precipitate in each case below;
a) a saturated solution of sodium nitrate
in 400 cm3 of water at 100° C is made.
The temperature i s then changed to 13° C.
c) 500.0 g of sodium nitrate
in 500 cm3 of water.
b) a saturated solution of potassium nitrate
in 250 cm3 of water at 80° C is made.
The temperature is then changed to 8° C.
3. The dissolving of both salt and sugar involves the solid separating into particles too small to see. The salt solution contains ions of sodium and chlorine and will conduct a current, while the sugar dissolves to release sugar molecules, so its solution will not conduct electricity.
Try This Activity: Substances i n Water
(a) The potassium...
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