Name: _______________________________________________ Date: ___________________ Pd: _________
Unit 9 Worksheet 2 – Solubility Problems
Use this graph to answer the following questions. If math is involved, circle your answers.
Steps to answer the problems.
Remember that this graph represents solubility in
100g of water. If the problem does not give you 100g
of water, set up proportions.
Grams of salt (solubility from graph) = New g of salt
100g of water
g of water
given
Any one of these can be variables, read the
question thoroughly.
Solve for x. For example:
How many grams of potassium dichromate can
dissolve in 200 grams of water at 40 C?
In the graph, about 22g of Potassium dichromate
(K2Cr2O7) is soluble at 40C. This graph shows
solubility for 100g of H2O, the question is asking
in 200g of water,
Set up proportions:
22gK2Cr2O7 = x gK2Cr2O7
100g H2O
200g H2O
Solve for x. This will allow you to solve for the
amount in 200g of water instead of 100g of water.
Remember, if the problem says 100g of water, you do
not need math, interpret the graph.
1.
How many grams of sodium nitrate can be dissolved in 100 grams of water at 20 C?
2. How many grams of potassium dichromate can dissolve in 300 grams of water at 40 C?
3. How many grams of potassium dichromate can dissolve in 167 grams of water at 40 C?
4. A solution is prepared by dissolving 50 grams of potassium chloride in 200 grams of water at 50  C.
Use the correct terminology to describe this solution.
5. A saturated solution is prepared by dissolving 55.81 g of barium hydroxide in 175 grams of water at 20
C. What is the solubility of the compound?
6. A saturated solution is prepared by dissolving 722 g of silver nitrate in 325 grams of water at 20 C.
What is the solubility of the compound?
Use the table to answer the following questions:
Substance
AlCl3
KClO3
NaCl
O
0 C
30.84
4.0
35.7
Solubility (g/100g H2O)
20 OC
31.03
7.4
36.0
50 OC
31.60
19.3
37.0
100 O
33.32
56.0
39.2
7. How much AlCl3 can be dissolved in 305 grams of water at 50 OC
8. How much potassium chlorate can be dissolved in 215 grams of water at 20OC?
9. How much sodium chloride can be dissolved in 100 grams of water at 100 OC?