Consider carefully the strictly measured coagulation (flocculation) values of various common electro — Surface Chemistry Chemistry Question

💡 Solution & Explanation

Standard $As_2S_3$ sol is strictly negatively charged due to $S^{2-}$ adsorption, so entirely cations are the active coagulating agents (Statement B is false). According to Hardy-Schulze, higher valency cations strictly possess massively higher coagulating power and consequently vastly lower flocculation values. $Na^+$ has an exponentially higher value strictly than $Ba^{2+}$ (Statement A is absolutely true). $Al^{3+}$ has far greater coagulating power strictly than $Ca^{2+}$ (Statement C is true). The precise coagulation value is uniquely the *minimum* concentration definitively required to cause precipitation, not the absolute maximum it can heavily withstand (Statement D is entirely false).