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Aluminum hydroxide forms a positively charged sol. Which of the following ionic substances should be most effective in coagulating the sol?

Aluminum hydroxide forms a positively charged sol. Which of the following ionic substances should be most effective in coagulating the sol?
NaCl
CaCl2
Fe2(SO4)3
K3PO4
The idea behind coagulating sols is to use those salts that have the highest + and - charges and the most ions.
so how do i tell which has the highest + and - charges

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