Title: Solubility of a salt
Objective: How does temperature affect solubility?
Procedure:
Test
tube
1
2
3
4
Grams of
KNO3/5 mL
H 2O
2g/5ml
4g/5ml
6g/5ml
8g/5ml
Conversion
based on a
100 ml
Crystallization
temperature
(OC)
Using the conversion scale, graph the affects of solubility versus
temperature.
1. According to your graph, how many grams of KNO3 can be
dissolved in 100mL of H2O at the following temperature?
a. 30 OC b. 40OC c. 60OC d. 70OC
2. Using the reference tables, find the actual amount and compare
the results to question one.
3. Define the terms saturated, unsaturated, supersaturated, and
equilibrium.
4. Using the reference table, classify the following KNO3
solutions as saturated, unsaturated, and supersaturated.
a. 75 g KNO3/100 ml H2O at 40OC
b. 60 g KNO3/100 ml H2O at 50OC
c. 60 g KNO3/200 ml H2O at 30OC
5. How does the solubility of a gas change with increasing
temperature?
Draw a rough sketch showing the general shape of the solubility
curve of a gas.
6. Based of the reference tables, which of the compounds
represented become less soluble as temperature increases?