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The high viscosity associated with the hydrophilic colloids allow you to
interact the dispersion phase with the dispersion medium
The low viscosity associated wit the hydrophobic colloids prevent the
dispersion phase from interacting with the dispersion medium
The hydrophilic colloid haS a
difficult time passing light through the colloid
- it has a low Tyndall Effect
The hydrophilic colloids are
they are not reactive to a low concentration of electrolytes
The hydrophobic colloids are
they are very sensitive to a low concentration of electrolytes
If you take a hydrophilic colloid heat it, get rid of the water and then place it back into water it
can be reused again
How are hydrophilic colloids created
by mixing the colloid in water, there is no special procedure required
How are hydrophobic colloids created
via chemical or physical means
- mortal and pestle via grinding into smaller pieces
Hydrophobic colloids do
not ionize when placed in water but they become charged by picking up ions from the dispersion medium during preparation
Hydrophobic colloids can be prepared physically by
grinding up the substance with a mortal and pestle and then adding them to the dispersion medium
Methods used to prepare a hydrophobic colloid include
When preparing a hydrophobic colloid you have to manipulate the particle size by getting it into
colloïdal range by changing the solvent
- this is known as the condensation method
Manipulation of the size of colloid sulfur occurs by adding sulfur to hot alcohol to produce
sulfur in the sub colloidal range
at this point the substance is insoluble in water and it will precipitate our
Once the colloidal sulfur has been precipitated out its in
- it then has charges that will allow it to be kept in suspension
A high concentration of NaCl with a low concentration of AgNO₃ the particle will be
A low concentration of NaCl with a high concentration of AgNO₃ the particle will be
Hardy states that the
arrangement od the ions should be based upon their ability to precipitate hydrophobic colloids related to the value of the compound
NaCl+ has the
lowest precipitate port and it take more NaCl to ppt in the hydrophobic colloid
less sensitive to electrolytes
If you treat a hydrophobic colloid with a hydrophilic colloid (protective) the hydrophobic colloid
will not respond to the change in e-
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