Which of the following salt solutions would coagulate the colloid solution formed when $\mathrm{FeCl_3}$ is added to $\mathrm{NaOH}$ solution, at the fastest rate?
Solution
In the coagulation of a negative sol, the flocculating power is in the order.
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$\therefore \mathrm{Al}^{3+}>\mathrm{Ba}^{2+}>\mathrm{Na}^{+}$and $\mathrm{FeCl}_{3}$ with $\mathrm{NaOH}$ forms a negative sol.
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$\therefore \mathrm{AlCl}_{3}$ coagulate it most.
About this question
Subject: Chemistry · Chapter: Surface Chemistry · Topic: Adsorption
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