Solubility grade 7

1. Factors affecting Solubility

2. Activity 1
 Solutions are found at home and in
the environment.
 Solutions are made up of solutes and
solvents.
 Solutions can be solid, liquid or gas.
 Solutions can be naturally occurring or
manufactured.

3. Activity 2
 Solutions have only one phase, thus,
a uniform appearance.
 The components of a solution cannot
be separated through filtration
because their particles are very small
that they can pass through the holes
of the filter paper.

4. Activity 3
 A saturated solution is a solution that
contains the maximum amount of
solute that the solvent can dissolve.
 The presence of excess solute that
can no longer dissolve is the evidence
that a solution is saturated.
 An unsaturated solution is a solution
that contains less solute than the
maximum amount that the solvent can
dissolve.

5. Concentrations of solutions
 percent by volume – amount of solute
in a given volume of solution (g/100
mL)
 percent by mass – amount of solute in
a given mass of solvent (g/100g)

6. What could affect the solubility of
solutes in solutions?
Add a teaspoon of
salt
Add a teaspoon of
salt
Stirre
d
Not stirred

7. Why would the solute dissolve
faster when the solution is
stirred?

8. Why would the solute dissolve
faster when the solution is
stirred?

9. Why would the solute dissolve
faster when the solution is
stirred?

10. Why would the solute dissolve
faster when the solution is
stirred?

11. Why would the solute dissolve
faster when the solution is
stirred?

12. Why would the solute dissolve
faster when the solution is
stirred?

13. Stirring causes the
particles of solute
and solvent to move
faster increasing
the chances of
contact.

14. Activity 4
 Which will dissolve faster – crystals of
table salt or the same amount of
crushed table salt?

15. Procedures
Add 50 mL of water into 2
identical containers.
Add 5 grams of rock salt
to one container and 5
grams iodized salt to the
other container.
Record the time it takes
the salt to dissolve in each
of the containers.
Independent
variable
Dependent
variable

16. What makes the crushed salt
dissolve faster than the crystals
of salt?
crystal of
table salt
crushed
table salt

22. Smaller particles have more edges
and corners where the
solvent can be in contact.
Thus, the smaller the particle of
salt, the easier it
mixes with water.

23. The Coffee Problem
 Why do people stir coffee in water
after they have added sugar?

24. Parallel Investigations
 Activity 5: How fast does coffee
dissolve in hot water? In cold water?
[G1-G5]
 Activity 6: Which dissolves faster in
hot and cold water: sugar or salt? [G6-
G10]

25.  Prepare a lab sheet that will answer
the problem assigned to your group.
 Do not forget to formulate a
hypothesis for your problem.
 Bring the materials that you will need
for the investigation next session.