Arsenic sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in coagulating the sol?

Arsenic sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in coagulating the sol?
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Arsenic sulphide forms a sol with a negative charge. Which of the following ionic substances should be most effective in ... )_(3)` D. `Na_(3)PO_(4)`
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