Solubility and Temperature
NCVPS Chemistry Fall 2014
Vocabulary: concentration, dissolve, homogeneous mixture, solubility, solubility curve, solute,
solution, solvent
Prior Knowledge Questions (Do these BEFORE using
...
Solubility and Temperature
NCVPS Chemistry Fall 2014
Vocabulary: concentration, dissolve, homogeneous mixture, solubility, solubility curve, solute,
solution, solvent
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
1. What happens when you stir a spoonful of sugar into hot water? The sugar will dissolve in to
the water.
2. When sugar or another substance is dissolved in water, it disappears from view and forms
a homogeneous mixture with the water, also called a solution.
If you can’t see the sugar, how can you tell that it is there? Well you can taste it and it would
make the water look cloudy.
3. Does sugar dissolve more easily in hot water or cold water? Hot water.
Gizmo Warm-up
A solution generally consists of two parts, a solute that
is dissolved and a solvent that the solute is dissolved
into. For example, sugar is a solute that is dissolved into
the solvent water. In the Solubility and Temperature
Gizmo™, you will study how temperature affects how
much solute will dissolve in a solution.
To begin, check that Potassium nitrate is selected and
the Temp. of the water is 20 °C. Click OK.
1. In this solution, what is the solute? Potassium nitrate What is the solvent? Water
2. Click Add 10 g to mix 10 g of potassium nitrate into the water.
A. Did all of the potassium nitrate dissolve? Yes
B. How can you tell? I can’t see it anymore and it’s not on the bottom of the glass
Activity A:
Solubility
Get the Gizmo ready:
Click Reset.
Check that the Temp. is 20 °C and that Potassium
nitrate is selected.
Question: How do we find how much solute can be dissolved in a solvent?
1. Observe: Click OK. Click Add 20 g, and observe the potassium nitrate being mixed into the
solution. On the right, select the BAR CHART tab and turn on Show numerical value. The
bars show how much solute has been added and how much has piled up on the bottom.
Did all of the solute dissolve? Yes
2. Experiment: Click Add 20 g again.
A. Did all of the solute dissolve? Explain how you can tell. No because there is 9.35g on
the bottom of the glass
B. Based on the amount of solute added and the amount piled up on the bottom, how
many grams of solute dissolved in the water? 30.65grams
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