The classify of colloid systems
Standard Competence : 4. Describe the characteristic of solution, measurement method and its
application
Basic Competence : 4.8 Group the colloid systems based on the experiment result and the
useful in industry
Indicator
a.
Analyze the
differences of true solution, colloid, and suspension
b. Analyze the kinds of
colloid system
Materials
Colloid is derived from Greek kolla, meaning glue. Old time glues were
colloidal dispersions in water. Colloids, also called colloidal dispersions or
colloidal suspensions, are mixtures that are intermediate between true
solutions and suspensions. Because of the way the size of colloidal particles compare
to the dimensions of the particles of the medium in which they are distributed,
we don’t use the terms solute and solvent. Instead, we refer to the dispersed
phase and the dispersing medium. Dispersed phase is a substance which is
dispersed, while dispersing medium is the medium which used to disperse.
Table 1.1.
The differences of solution, colloid, and suspension
SOLUTION
|
COLLOID
|
SUSPENSION
|
Ex : sugar solution in water
|
Ex : milk mixture in water
|
Ex : starch mixture in water
|
1.
Homogeneous, can not be
differentiated although use ultra microscope
2.
All particles have dimension
(length, width, tick) less than 1 nm
3.
One phase
4.
Stable
5.
Can not be filtered
|
1.
Under microscope has
homogeneous properties but under ultra microscope has heterogeneous
properties
2.
Particles has dimension
between 1 nm until 100 nm
3.
Two phases
4.
Generally stable
5.
Can not be filtered except
use ultra filter
|
1.
Heterogeneous
2.
One of particles or all
particles have dimension more then 100 nm
3.
Two phases
4.
Not stable
5.
Can be filtered
|
Table 1.2. Types of colloidal dispersions
Dispersing Medium
|
Dispersed Phase
|
Colloid Type
|
Examples
|
Solid
|
Solid
|
Solid sol
|
Pearls
|
Solid
|
Liquid
|
Solid emulsion
|
Cheese
|
Solid
|
Gas
|
Solid foam
|
Marshmallow
|
Liquid
|
Solid
|
Sol, gel
|
Paint
|
Liquid
|
Liquid
|
Emulsion
|
Milk
|
Liquid
|
Gas
|
Foam
|
Whipped cream
|
Gas
|
Solid
|
Solid aerosols
|
Smoke
|
Gas
|
Liquid
|
Liquid aerosols
|
Clouds
|
No
|
Dispersing Medium
|
Dispersed Phase
|
Colloid Tape
|
Examples
|
1.
|
Solid
|
Solid
|
Pearl, Opals
|
|
2.
|
Solid
|
Liquid
|
Solid emulsion
|
|
3.
|
Solid
|
Solid foam
|
Marshmallow, pumice
|
|
4.
|
Liquid
|
Solid
|
Sol, Gel
|
|
5.
|
Liquid
|
Liquid
|
Emulsion
|
|
6.
|
Gas
|
Foam
|
Whipped cream, shaving cream
|
|
7.
|
Gas
|
Solid
|
Smoke, dust
|
|
8.
|
Gas
|
Liquid aerosols
|
Clouds, mist, fog
|
Answers :
No
|
Dispersing
Medium
|
Dispersed
Phase
|
Colloid Tape
|
Examples
|
1.
|
Solid
|
Solid
|
Solid sol
|
Pearl, Opals
|
2.
|
Solid
|
Liquid
|
Solid
emulsion
|
Cheese, butter
|
3.
|
Solid
|
Gas
|
Solid foam
|
Marshmallow,
pumice
|
4.
|
Liquid
|
Solid
|
Sol, Gel
|
Jelly, starch in water, paint
|
5.
|
Liquid
|
Liquid
|
Emulsion
|
Milk, ice cream, mayonnaise, lotion
|
6.
|
Liquid
|
Gas
|
Foam
|
Whipped
cream, shaving cream
|
7.
|
Gas
|
Solid
|
Solid aerosols
|
Smoke, dust
|
8.
|
Gas
|
Liquid
|
Liquid
aerosols
|
Clouds,
mist, fog
|
TOTAL SCORE : 8 x 10 =
80
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