11/26/2015
Solutions and The Dissolving
Process
Learning Goals:
I will be able to explain the difference between homogeneous and heterogeneous mixtures.
I will be able to explain the components of a solution.
I will be able to apply the rule "Like dissolves Like".
What is a solution?
A solution is a homogeneous mixture (one phase) of 2 or more
substances.
It is made from a solute (lesser amount) dissolved in a solvent
(greater amount).
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11/26/2015
Types of Solutions
Gas – Gas: air
Gas – Liquid: carbonated drinks
Liquid – Liquid: Gasoline, Vinegar, Alcoholic Beverages
Solid – Liquid: salt water, glucose in water
Solid – Solid: usually metals (alloys)
Concentrations
Concentration – the ratio of the quantity
of solute or solvent.
Concentrated – a large quantity of solute
dissolved per unit volume
Dilute – a small quantity of solute
dissolved per unit volume
Saturated – a solution where no more
solute can be dissolved
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11/26/2015
The Dissolving Process – Dissociation of
IONIC Compounds
Hydration: The process of water molecules surrounding
ions.
Dissociation: the separation of ions from an ionic cmpd
as it dissolves in water.
http://k12resources.nelson.com/science/978017652946
8/student/more/school_flash.html?file=8_3_dissolving_s
alt
Writing Dissociation Eqns
Write a chemical equation for the dissociation of sodium carbonate.
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11/26/2015
Dissolving Molecular Compounds
Miscible – able to form solutions
Immiscible – unable to form solutions
Recall – Like Dissolves Like
Surfactants
Are substances that encourage oil and water to mix.
They have a hydrophobic and a hydrophilic part.
They break down hydrogen bonds to reduce surface tension.
This is why dish soap can “cut through the grease”
http://k12resources.nelson.com/science/9780176529468/student/m
ore/anim/8_3_ani_surfactant_oil_interaction_14m11an1.html
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11/26/2015
Today’s Tasks
Define: heterogeneous, homogeneous, solute, solvent, amalgam,
aqueous solution
Pg. 381 #1, 3-5, 9
Pg. 384 #1
Pg. 389 #3, 8, 10, 13, 14
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