Question
Chemistry Question on Solutions
Which of the following salt solutions would coagulate the colloid solution formed when FeCl3 is added to NaOH solution, at the fastest rate?
A
10 mL of 0.1 mol dm–3 Ca3(PO4)2
B
10 mL of 0.2 mol dm–3 AlCl3
C
10 mL of 0.1 mol dm–3 Na2SO4
D
10 mL of 0.15 mol dm–3 CaCl2
Answer
10 mL of 0.2 mol dm–3 AlCl3
Explanation
Solution
In the coagulation of a negative sol, the flocculating power is in the order.
So, Al3+ > Ba2+ > Na+ and FeCl3 with NaOH forms a negative sol.
therefore AlCl3 coagulate it most.