colloid, Chemistry

what are the classification of colloids ?
Posted Date: 1/6/2013 9:13:30 AM | Location : Philippines





Colloids are classified as two types which are the lyophilic / reversible and lyophobic / irreversible. If water is the dispersion medium, then the term used are hydrophilic and hydrophobic.

Lyophilic colloids: A colloidal system which may be constructed readily by simple warming or shaking the substance in a suitable solvent is called as lyophilic colloid. Substances that form lyophilic colloids involves gelatin, starch, and rubber, proteins, gum. Lyophilic colloids are also named as reversible colloids as on evaporating the dispersion medium such as water, the substance or the residue may be again reconverted into colloidal state simply by addition of the liquid i.e. water. These solutions are reasonably stable and usually cannot be easily precipitated.

Lyophobic colloids: colloids constructed with difficulty are termed as lyophobic colloids. These colloids are constructed by substances such as As2S3 , Fe(OH)3, gold and other metals that are sparingly soluble and thus their molecules do not pass readily into colloidal state. Lyophobic colloids are called as irreversible colloids since the residue cannot readily be reconverted into sol by ordinary means. These solutions are quite readily precipitated and hence they are not stable.
Posted by Nelson | Posted Date: 1/12/2013 10:01:15 PM


Related Discussions:- colloid, Assignment Help, Ask Question on colloid, Get Answer, Expert's Help, colloid Discussions

Write discussion on colloid
Your posts are moderated
Related Questions
how can you explain the fact that lanthinides are highly electopositive?

Co-ordination covalent bond is produced by the mutual sharing of pair of electrons among two atoms contributed by only one of the combining atoms.


Production Sensory analysis does not stop after the  product has been developed and is being produced routinely. However, it is critical that products continue to be analyzed

Q. Explain the Purity Tests of sesame oil? Purity tests for oils/fats would include analyzing the samples for the presence of sesame oil, cottonseed oil, linseed oil, argemone

WHAT IS THE PRINCIPLE OF EDTA TITRATION N?

Which of the following atoms and ions are isoelectronic i.e. have the same number of electrons with the neon atom: (1) F -                      (2) Oxygen atom         (


Determine five chemical reactions you observe  in your daily life. Observe the reaction carefully. Present the change in the condition of the reactants and products wit