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Zirconium phosphate \( \left[\mathrm{Zr}_{3}\left(\mathrm{PO}_{4}\right)_{4}\right] \) dissociates into three zirconium cations of charge \( +4 \) and four phosphate anions of charge \( -3 \). If molar solubility of zirconium phosphate is denoted by \( S \) and its solubility product by \( \mathrm{K}_{s p} \) then which of the following relationship between \( \mathrm{S} \) and \( \mathrm{K}_{\mathrm{sp}} \) is correct?
(1) \( S=\left\{K_{s p} /(6912)^{177}\right\} \)
(2) \( S=\left\{K_{s p} / 144\right\}^{1 / 7} \)
(3) \( S=\left(K_{s p} / 6912\right)^{1 / 7} \)
(4) \( S=\left\{K_{s p} / 6912\right\}^{7} \)
\( \mathrm{P} \)
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