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The molar solubility (in mol \( \mathrm{L}^{-1} \) ) of a sparingly
\( \mathrm{P} \) soluble salt \( \mathrm{MX}_{4} \) is ' \( \mathrm{s} \) '. The corresponding solubility

W product is \( \mathrm{K}_{\mathrm{sp}} \). ' \( \mathrm{s} \) ' is given in terms of \( \mathrm{K}_{\mathrm{sp}} \) by the relation
(1) \( \mathrm{s}=\left(\frac{\mathrm{K}_{\mathrm{sp}}}{128}\right)^{1 / 4} \)
(2) \( \mathrm{s}=\left(\frac{\mathrm{K}_{\mathrm{sp}}}{256}\right)^{1 / 5} \)
(3) \( \mathrm{s}=\left(256 \mathrm{~K}_{\mathrm{sp}}\right)^{1 / 5} \)
(4) \( \mathrm{s}=\left(128 \mathrm{~K}_{\mathrm{sp}}\right)^{1 / 4} \)
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