Question
Chemistry Question on Surface Chemistry
Why is alum added to water containing suspended impurities?
A
To make a colloidal solution
B
To coagulate the suspended impurities
C
To remove impurities of calcium and magnesium
D
To protect the colloidal solution from getting precipitated
Answer
To coagulate the suspended impurities
Explanation
Solution
The water obtained from natural sources often contains suspended impurities. Alum is added to such water to coagulate the suspended impurities and make water fit for drinking purposes.