Reading Solubility Curves

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What is Solubility?
The maximum amount of a substance that
will dissolve in a certain amount of solvent
at a given temperature is called that
substances solubility in that solvent
 Solute = is dissolved
 Solvent = does the dissolving
 Example: __ grams of salt (NaCl) in 100 g
of water at __ ˚C.

Temperature and Solubility
The temperature of the solution affects
how much of the solute is dissolved by the
solvent.
 Increasing the temperature does not
always increase the solubility.
 Solubility curves are used to show how
the solubility of a substance changes with
temperature.

To read the
graph, find
the line for
the
substance.
The amount
that dissolves
at a given
temperature
is on the yaxis.
How much KNO3 dissolves
in 100g H2O at 50oC?
1. Find the line (red)
2. Find the temperature
and follow up to the
line. (green)
3. Read across to the yaxis and this is the
answer. (blue)
4. Since it is above the ½way between 80 and
90, it is 87.
What kind of solution do you
have?
A point on the line is a saturated solution.
 Above the line is supersaturated.
 Below the line is unsaturated.

Your turn! Use your graph
1.
2.
3.
4.
5.
How much NaCl will dissolve in 100g H2O
at 35oC?
How much NH4Cl will dissolve at 50oC?
What is the solubility of SO2 at 25oC?
What is the solubility of KClO3 in 100
grams of water at 35oC?
What is the solubility of KI in 100 grams
of water at 10oC?
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