Question

For coagulation of arscnious sulphide sol, which one of the following salt solution will be most effective ?

• A. ${AlCl3}$
• B. ${NaCl}$
• C. ${BaCl2}$
• D. ${Na3PO4}$

Answer 1

Answer: (A)

${AlCl3}$

Answer 2

Sulphide is $-ve$ charged colloid so cation with maximum charge will be most effective for coagulation.
${Al^{3+} > Ba^{2+ } > Na^{+}}$ coagulating power.