Solution, Suspensions and

sixcageyΜηχανική

22 Φεβ 2014 (πριν από 3 χρόνια και 7 μήνες)

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Solution, Suspensions and
Colloids

Mixtures


Demo


Write down your observations & notes

Solution

Solutions


soluble mixtures


Homogenous mixture


Small particle size, invisible to the naked eye


Salt water, sugar water



Demo


Write down your observations & notes

Colloid

Colloids: floating insoluble mixtures


Medium sized particles held together by
Brownian motion (erratic motion of particles
bumping into one another)


Milk, paint, fog, honey, smoke, ink, gum,
gelatin, marshmallows, butter, cosmetics,
shampoos, oil and water with soap
(emulsifier)


Tyndall Effect


Light scattered due to
Brownian motion

Tyndall Effect

Demo


Write down your observations & notes

Suspension

Suspensions


sinking insoluble
mixtures



Mixtures that contain particles that settle out
if left undisturbed.


Particles > 10
-
6

m


Can be filtered


Blood, aerosols, cornstarch and water, Italian
salad dressing,

Cream Layer

Milk layer

This is raw milk


straight from the cow

In summary

The difference is…..

Property

True

Solution

Colloidal Solution

Suspensions

Particle Size

Less than 10
-
9m

Between 10
-
7 and 10
-
9m

Greater than

10
-
7m

Visibility of particles


Invisible

to naked eye
not visible under
powerful microscope

Invisible to the naked
eye.

Visible under
powerful microscope

Easily visible

Sedimentation of
particles

Do

not settle down

Settle down under
high centrifugation

Settle down due to
gravity

Filtration through
filter paper

No residue is formed

No residue

is formed

Residue is formed