SOLUBILITY
Ms. Den-den
• Today, we will understand that the
concentration of a solution relates to
how many particles of the solute are
present in a volume of a solvent.
LEARNING
OBJECTIVE
• Highlight TWO important
vocabulary words from our learning
objective.
I can …
LEARNING
OUTCOMES!
-
-
Define dissolving solvent, solute, and solution and give
examples.
Define soluble and insoluble substances
Understand that solutes are still present although they are
transparent in a solution.
Record mass using a balance to demonstrate this.
List and explain the factors affecting solubility.
Differentiate between homogeneous and heterogeneous
mixtures.
Explain the conservation of mass principle.
Recognise ionic substances as those more likely to dissolve
(rather than covalent).
What VAS values will
be most important in
our lesson today?
MIXTURE PICNIC
Notes
Week ____
Vocabulary
Word
Mixture
Solubility
Definition
Two or more different substances not
chemically bonded. Can be separated easily /
without chemical reaction
Solution
A specific type of mixture where on substance
is dissolved into another, uniform
homogeneous mixture
Dissolve
A solid breaks apart to become part of a liquid
and form a solution
Notes
Week ____
Vocabulary
Word
Solute
Solvent
Solubility
Definition
What is dissolved in a solution - example: salt
and water (salt would be the solute)
What is dissolving things in a solution example: salt and water (water would be the
solvent)
Notes
-
-
Soluble and Insoluble
Soluble: solid that can
dissolve, solution becomes
clear
Insoluble : solid that cannot
be dissolved, solution
becomes cloudy
Notes
Solubility
Solubility is a property referring to the ability for a given substance (the solute) to
dissolve in a solvent.
Factors affecting solubility:
● Temperature - Solubility increases with temperature (not gas).
● Pressure - For most solid and liquid solutes, pressure does not affect solubility. The solubility of
gas is directly proportional to the pressure of the gas.
● Particle size - Smaller particles dissolve faster.
● Ratio - Amount of solute to solvent.
● Stirring - Increases the speed of dissolving.
● Polarity - In most cases solutes dissolve in solvents that have a similar polarity.
Notes
The Law of Conservation of Mass dates from Antoine Lavoisier's 1789
discovery that mass is neither created nor destroyed in chemical reactions.
In other words, the mass of any one element at the beginning of a reaction
will equal the mass of that element at the end of the reaction.
In a sugar water solution, what is the solute?
A. Sugar
B. Water C.
Salt
The solute is
what is being
dissolved.
In a sugar water solution, what is the solvent?
A. Sugar
B. Water C. Salt
The solvent is
what is doing the
dissolving.
When sugar dissolves in water, it loses mass.
The law of
conservation of
mass states that
mass cannot be
created or
destroyed.
True
False
What mass of salt solution is made when 9 g
of salt is dissolved in 50 g of water? Explain
how you worked out your answer.
Answer!
The mass of the salt solution is 59 g. There are 9 g
of salt and 50 g of water. When they are mixed
there is conservation of mass. 9 + 50 = 59 g
A green powder was placed into a beaker of water.
After it was stirred, the water looked cloudy and lumps
of powder could still be seen. Has a solution been
formed? Explain your answer.
Answer!
No solution has been formed. Solutions are transparent
because the solvent separates the particles of the solute. The
particles of the water bump into the particles of the solid and
break the forces that hold the solid together. In this case the
solid is not soluble in water.
204 grams of sugar dissolve in 100 grams water at 20 o C.
How many grams of sugar dissolve in 250 grams of water?
Answer! 204 x 2.5 = 510 grams of
sugar dissolve in 250 grams of water
362 grams of sugar dissolve in 100 grams water at 80o C.
How many grams of sugar dissolve in 250 grams of water?
Answer! 362 x 2.5 = 885 grams (375
grams more at 80oC)
1. What will happen to the mass on
the scale when the scientist adds
salt to the water?
a. The mass will increase
b. The mass will decrease
c. The mass will stay the same
2. Make a prediction: What will
happen to the mass of the water and
salt after the salt dissolves in the
water?
3.
What conclusion could you make
about this experiment? What happens to
the salt when it dissolves? Does it
disappear?
4. How did the scientist increase the rate
that the salt dissolved?
a. Heating it up
b. Tasting it
c. Stirring it
d. He did nothing to the solution to
change the rate
SCIENCE
WORKBOOK
2.1 EXERCISES
2.1 A-C
WORKBOOK ANSWERS
Self Reflection - Learning Outcomes!
I can …
-
Define dissolving solvent, solute, and solution and
give examples.
Define soluble and insoluble substances
Understand that solutes are still present although
they are transparent in a solution.
Record Mass using a balance to demonstrate this.
List and explain the factors affecting solubility.
Differentiate between homogeneous and
heterogeneous mixtures.
Explain the conservation of mass principle.
Recognise ionic substances as those more likely to
dissolve (rather than covalent).
How well do you feel you
understand the material?
Great job!