Question

hich among the following is the best coagulating agent for a negatively charged sol ?

MgCl2 , Na2SO4 or Al2(SO4)3​

Answer 1

Answer:

12th

Chemistry

Surface Chemistry

Properties of Colloids

Among the electrolytes Na2S...

CHEMISTRY

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Asked on October 15, 2019 by

Shree Sehgal

Among the electrolytes Na

2

SO

4

,CaCl

2

,Al

2

(SO

4

)

3

and NH

4

Cl, the most effective coagulating agent for Sb

2

S

3

solution is:

HARD

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VIDEO EXPLANATION

ANSWER

Sb

2

S

3

is a negative sol.

So, Al

2

(SO

4

)

3

will be the most effective coagulant due to higher charge density on Al

3+

in accordance with Hardy-Schulze rule.

According to Hardy-Schulze rule, greater the valency of active ion, greater will be its coagulating power.

Thus, Hardy-Schulze rule states the following:

i. The ions carrying the charge opposite to that of sol particles are effective in causing coagulation of the sol.

ii. The coagulating power of an electrolyte is directly proportional to the valency of the active ions (ions causing coagulation).