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At \( 25^{\circ} \mathrm{C}, K_{s p} \) for \( \mathrm{PbBr}_{2} \) is equal to \( 8 \times 10^{-5} \). If the salt is \( 80 \% \) dissociated, what is the solubility of \( \mathrm{PbBr}_{2} \) in mol/litre?
(a) \( \left[\frac{10^{-4}}{1.6 \times 1.6}\right]^{1 / 3} \)
(b) \( \left[\frac{10^{-5}}{1.6 \times 1.6}\right]^{1 / 3} \)
(c) \( \left[\frac{10^{-4}}{0.8 \times 0.8}\right]^{1 / 3} \)
(d) \( \left[\frac{10^{-5}}{1.6 \times 1.6}\right]^{1 / 2} \)
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