Solutions
Double, Double, Toil, and
Trouble…
Kool Aid drinks are solutions

Solutions are homogenous mixtures of two or
more pure substances in a single phase
 Contains a solvent and solute
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Solvent: dissolving medium (water)
Solute: dissolved substance (salt)
Particle sizes are the smallest
Will not separate while standing
Do not filter
Do not scatter light
Colligative properties are affected
Electrolytes
 Some
substances will conduct electricity
when dissolved in water...these are called
electrolytes.
 Sodium, Potassium, and Calcium are
electrolytes that are found in most sport
drinks.
 Used to transport nerve signals.
Solutions
Muddy water is a Suspension
 Suspensions
are heterogeneous mixtures
that have the largest particles of all
mixtures

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Will separate upon standing
Can be filtered
Do scatter light
Colligative properties are unaffected
Examples: Muddy water, Cu Lab.
Suspensions
Milk/Gelatins are Colloids

Colloids are homogeneous mixtures that have
particles that are medium in size.
 Particles remain dispersed in liquid due to
random particle motion of surrounding
molecules.
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Will separate very slowly or not at all
Will not filter
Will scatter light
Colligative properties are unaffected.
Eggs Are Colloids
 The
proteins in the egg white are large
enough to scatter light, but mix well in
water.
 This only occurs when the eggs are put
into water RAW!!
I Like Raw Eggs
What is this scattering light?
Tyndall Effect
 Light
bounces off objects it cannot pass
through, is scattered by objects, or passes
right through objects.
 The scattering of light as it passes through
a transparent medium is called the Tyndall
Effect.
 When
focused light is shined on a
homogeneous solution the light will not be
scattered; it will pass right through.
 When focused light is shined on a colloid
the light will be scattered and no longer as
focused.
What are they?
 Oil
and vinegar salad dressing?
 Gelatin?
 Starch in water?
 Smoke in air?
 Salt in water?
 Clay in water?
 Food coloring in water?
 Carbon
dioxide in water?
 Steam in air?
 Table sugar in water?
 Milk?
 Bleach?
 Ammonia?
 Tea?