koloid and its properties
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KOLOID AND ITS PROPERTIES
By :Ika Farida Yuliana ( 093194007 )Noor Fathi Maratusholihah (093194022)Yudit Yulianinda (0931940 )
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Definition
•Colloid is a “ metastable” mixture system ( as though in stable condition, but it will separate after a certain time)
•Colloid different with the solution stable•Generally, there are 2 substance in colloid :
- Dispersed substance dissolved substance in colloid - Disperser substance solvent in colloid
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Dispersed Phase Disperser Name Example
Gas Gas Not colloid, gas mix homogenously
Gas Liquid Foam Wave, soap
Gas Solid Compact foam Foam bed
Liquid Gas Liquid aerosol Fog, hair spray
Liquid Liquid Emulsion Milk, mayonnaise
Liquid Solid Gel Butter
Solid Gas Compact aerosol
Spot
Solid Liquid Sol Tint , paint
Solid Solid Compact solid Sand , glass
Colloids based on its dispersed and disperser
phase :
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Colloid Properties
Tyndall effect
Liofil and
LiofobCoagulatio
n
Colloid charge
Brown motion
Adsorption
Purification
Stability
Emulation
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1. Tyndall effect•Tyndall effect is light dispersal by colloid solution, an instance where the way of light in colloid can be seen because colloid particle can scatter light to all direction.
•Example: sunshine that scattered colloid particle at sky, up to blue colored sky in the day time and pink in the evening; dust in room will be seen if there incident ray passes gap.
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• True solution (left picture) is illuminated with light, not scatter light,
• Colloid system (right picture) light scattered.
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2.Brownian Motion
•Particles movement can has random like in hydrogen and gas, or only vibrate in place like in solid substance.
•Collision go on from all direction . Because particle size enough little, so collision that inclined uneven.
•So that found a collision resultant that causes particle movement direction change so that happen movement zigzag or Brownian movement.
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# Brownian motion factor :•Smaller the size of particle, faster the
Brownian motion difficult to be seen•Higher temperature , faster Brownian
motion
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3. Adsorption•Adsorption is absorption of substance or
ion on colloid surface. character adsorption used in course of: 1. cana sugar purifying. 2. norit. 3. water depurating.
•Example: colloid between diarrhea
medicine and liquid in intestines that will absorb diarrhea cause germ.
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•colloid Fe(oh)3 will adsorb H+ so that will be to contain +.
•colloid As2S3 adsorb OH- ion in solution so that will contain -
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4. Colloid Charge •Have same type of charge give stability
to system•Determined by ion charge absorbed by
colloid surface•Can move in electric field•example: factory chimney set metal plate
that contain electricity as a mean to crumpling the dust.
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5. Coagulation•Coagulation colloid is colloid clotting
because electrolyte the load contrary to. •example: dirt in water that crumpling by
alum so that water is clear. • factors that causes coagulation: • temperature change. • informer. • increasing ion with big load (example:
alum). • positive colloid mixing and negative
colloid.
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6. Liofil and liofob colloid•Happen in sol condition• Liofil ( like water ) adsorb the liquid ,
so it forms cover around the colloid- Dispersed phase’s affinity > disperser media- Example : starch sol, jelly , glue
•Liofob ( dislike water ) not adsorb the liquid
- dispersed phase’s affinity < disperser media - Example : Sulfur sol , golden sol
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7.Emulasion•Emulasion is liquid colloid in liquid
medium. so that solution kolid stable, into colloid usually added emulsifier, that is substance penyetabil so that stable colloid.
•example: milk is underwater fat emulsion with kasein as emulsifier.
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8.Colloid stability
a. many colloids that must be defended in the form of colloid to its use.
• example: ice-cream, ink, paint. • for that be used colloid other that can form
layer at around colloid. colloid other this called patron colloid.
• example: gelatine in sol fe(oh)3. b. for colloid shaped emulsion can be used
emulgator that is substance that can interested in second liquid that form emulsion
• example: detergent soap as emulgator from oil emulsion and water.
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9. Purification of Colloids
•By cleaning the disturbing ions dialysis•It will be faster if the electric current is
added electro dialysis
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Thank You