Question

For the coagulation of a negative sol, the species below, that has the highest flocculating power is:

• A. $S{O}_4^{2-}$
• B. $N{a}^{+}$
• C. $B{a}^{2+}$
• D. $P{O}_4^{3-}$

Answer 1

The correct option is C $B{a}^{2+}$

Answer: (c)

For a negative sol, a positive ion is required for flocculation.

Greater the valence of the flocculating ion added, the greater is its power to cause precipitation.

This is called Hardy-Schulz law.

So, $B{a}^{+2}$ has the highest flocculating power.