Chemistry
Give reason:
Alum is used in purification of river water.
Elements, Compounds & Mixtures
12 Likes
Answer
Water from a river contains very fine clay particles. To make them settle at a faster rate, a chemical substance called alum in powdered form is added to such mixtures. It dissolves in water and forms clusters with clay and dust particles making them heavier and, increasing the rate of sedimentation.
Answered By
7 Likes
Related Questions
Why do we need pure substances ?
Give reason:
Sand and sawdust cannot be separated by hand picking.
Give reason:
Magnet is used to separate a mixture of iron and sulphur.
The following diagram shows a method employed for the separation of a mixture. Study the same and answer the following questions:
(a) Label the parts shown as A, B and C.
(b) Write the name of the method depicted above.
(c) What kind of mixture is separated by this method?
(d) How can this process be made faster ?
(e) What is one disadvantage of this process ?