# Solubility Curves ```Solubility Curves- Interpreting Graph
SCH3U
Name:
Use the table below to answer the following questions.
Solubility of Some Substances in Water @ Various Temperatures
Solubility (g/100 g of H20)
Substance
Formula
0&deg;C
20&deg;C
50&deg;C
Ammonium chloride
Barium hydroxide
Barium sulfate
Calcium hydroxide
Lithium carbonate
Potassium chlorate
Potassium chloride
Sodium chloride
Sodium nitrate
Sodium sulfate
Silver nitrate
Lithium bromide
Cane Sugar (sucrose)
NH4Cl
Ba(OH)2
BaSO4
Ca(OH)2
PbCl2
Li2CO3
KClO3
KCl
NaCl
NaNO3
Na2SO4
AgNO3
LiBr
C12H22O11
29.4
1.67
0.00019
0.189
0.6
1.5
4
27.6
35.7
74
4.76
122
143
179
37.2
31.89
0.00025
0.173
0.99
1.3
7.4
34
36
88
62
222
166
230.9
50.4
100&deg;C
77.3
0.00034
0.07
1.7
1.1
19.3
42.6
37
114
50
455
203
260.4
0.7
56
57.6
39.2
182
41
733
266
487
1. Saturated solutions of each of the following compounds are made at 20&deg;C. Circle the letter(s) of the solution(s),
which will form a precipitate upon heating.
a) NaCl
b) Na2SO4
c) Li2CO3
d) Sucrose
2. A saturated solution of potassium chloride is prepared in 100.0 g of water at 20&deg;C. If the solution is heated to
50&deg;C, how much more KCl must be added to obtain a saturated solution? [8.6 g KCl]
3. A saturated solution of sucrose in 1000.0 g of boiling water is cooled to 20&deg;C. What mass of rock candy will be
formed? [2.561 Kg]
4. Using the data from the table, plot the solubility curves of KCl, LiBr, NaNO3 and Na2SO4 on the graph below. Be
sure to label each curve. Use the graph to answer the following questions.
350
Solubility (g/100g of water)
300
250
200
150
100
50
10
20
30
40
50
60
70
80
90
Temperature ˚C
W1
SCH3U
Solubility Curves- Interpreting Graph
Name:
USING SOLUBILITY CURVES ANSWER THE FOLLOWING QUESTIONS:
1. If 50 grams of water saturated with ammonium
chloride at 40C is slowly evaporated to dryness,
how many grams of the dry salt will be recovered?
[23g]
2. What is the smallest mass of water required to
completely dissolve 23 grams of ammonium
chloride at 40C? [50g]
3. A saturated solution of NaNO3 in 100 grams of
water at 40C is heated to 50C. What is the rate of
increase in solubility in grams per degree?[0.8 g/0C]
4. Which salt has solubility values that are least
affected by temperature? [NaCl]
5. If 30 grams of KCl is dissolved in 100 grams of
water at 45C, how many additional grams of KCl
would be needed to make the solution saturated at
80C? [20g]
6. At what temperature do potassium chlorate and
potassium nitrate have the same solubility in
water? [50 0C]
7. At 25C, 100 grams of water is saturated with
NaClO3. How many grams of NaClO3 will fall out of
solution when it cools to 0C? [30g]
8. At 50C, 100 grams of water is saturated with NaCl.
How many grams of NaCl will precipitate when the solution is cooled to 40C? [0.5g]
9. How many grams of sodium chloride are required to saturate 500 grams of water at 100C? [196g]
10. Which compound is least soluble in water at 12C? [KClO3 ]
11. Which compound is most soluble in water at 50C? [NH4NO3]
12. At 80C, 100 grams of water is saturated with KCl. How many grams of KCl will precipitate when the solution is
cooled to 45C? [12g]
13. A saturated solution of which compound contains 132 grams of solute per 100 grams of water at 70C.
[NaNO3, KNO3]
14. How many grams of sodium nitrate, are required to saturate 200 grams of water at 10C? [162g]
15. Which saturated solution of a chloride has the greatest percentage by mass of solute at 60C? [NH4Cl]
W2
SCH3U
Solubility Curves- Interpreting Graph
Name:
W3
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