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Zirconium phosphate \( \left[\mathrm{Zr}_{3}\left(\mathrm{PO}_{4}\right)_{4}\right] \) dissociates into
\( \mathrm{P} \) three zirconium cations of charge +4 and four

W phosphate anions of charge -3 . If molar solubility of zirconium phosphate is denoted by \( \mathrm{S} \) and its solubility product by \( \mathrm{K}_{\mathrm{sp}} \) then which of the following relationship between \( \mathrm{S} \) and \( \mathrm{K}_{\mathrm{sp}} \) is correct?
(1) \( \mathrm{S}=\left\{\mathrm{K}_{\mathrm{sp}} /(6912)^{1 / 7}\right\} \)
(2) \( \mathrm{S}=\left(\mathrm{K}_{\mathrm{sp}} / 6912\right)^{1 / 7} \)
(3) \( \mathrm{S}=\left\{\mathrm{K}_{\mathrm{sp}} / 144^{1 / 7}\right\} \)
(4) \( \mathrm{S}=\left\{\mathrm{K}_{\mathrm{sp}} /(6912)^{7}\right\} \)
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