Solutions & Solubility. Solution Humour :) .
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Transcript of Solutions & Solubility. Solution Humour :) .
Solutions &
Solubility
Solution Humour :)
http://www.redbubble.com/people/utherpendragon/works/9514801-if-youre-not-part-of-the-solution?p=sticker
Terms to Know
• Solution
• Homogeneous mixture
• Solvent
• Solute
• Variable composition
• Aqueous solution
• Miscible
• Immiscible
• Alloys
• Amalgam
• Solubility
• Saturated solution
• Unsaturated solution
Do you still remember how to classify matter?
Think-Pair-Share
List examples of:
soluble substances
insoluble substances
solutions
Share your list with your partner
Where does it belong?
•Put each mixture in column A or B. Justify your choice! sand in water, pop, vinegar in oil, gasoline, clear apple juice, brass, soil, silver-coloured dental fillings, smoke, chlorinated pool water, a jar of jelly beans, latex paint, compressed air in a scuba tank, chlorine bleach, pure liquid honey, chicken soup, humidity
A B
blood 24 karat gold
concrete air freshener
What is a Solution?• A solution is a homogeneous mixture of two or
more substances.• Homogeneous – has only one phase – either solid,
liquid or gas
• The solvent does the dissolving and is usually present in the largest amount.
• an aqueous solution has water as solvent
• The solute is the substance dissolved in the solution.
• Pure substances have fixed composition (H2O, 2 hydrogen and 1 oxygen), solutions are variable depending on the ratio of solvent to solute.
Definitions
Solution Solution
- - homogeneous mixture
Solvent Solvent - present in greater amount
Solute Solute - substance being dissolved
Types of Solutions
•We all know a transparent, coloured liquid in a test tube is a solution but…
• Can a solid or gas be a solution?
• YES! It can.• Eg. Air – 78% N2, 21% O2, 0.9% Ar, 0.03% CO2
•There are many different types of solutions. Can you think of some?
Types of Solutions
Teacher Demonstration•How can you determine whether two
liquids dissolve in each other?• Did the liquids in the first step dissolve in each other?
• Which liquid did the food colouring dissolve in?
• Did Lugol’s solution colour the oil, the water or both?
Teacher Demonstration
•Lava Lamp in a Bottle
How does this work?
Think about it……..
Solubility
•The maximum amount of solute that will dissolve in a given quantity of solvent at a specific T (temperature)
•Solubility is dependent on many factors but temperature and volume of solvent are the most important.
•A saturated solution is formed when no more solute is able to dissolve and there is excess solute present.
– A saturated solution represents an equilibrium: the rate of dissolving is equal to the rate of crystallization. The salt continues to dissolve, but crystallizes at the same rate so that there “appears” to be nothing happening.
Solubility
SATURATED SOLUTIONno more solute dissolves
UNSATURATED SOLUTIONmore solute dissolves
SUPERSATURATED SOLUTIONbecomes unstable, crystals form
concentration
Mind Maps
In partners, create ONE mind map using the following terms:
solubility solute saturated
solution unsaturated supersaturated
heterogeneous solvent aqueous solution
homogeneous precipitate temperature
Homework
Based on what you observed and discussed today, explain how the lava lamp demo worked.•Learning Check Q’s
p357 #1, 5, 6