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What is the concentration of \( \mathrm{Pb}^{2+} \) when \( \mathrm{PbSO}_{4}\left(K_{s p}=1.8 \times 10^{-8}\right) \) begins to precipitate from a solution that is \( 0.0045 \mathrm{M} \) in \( \mathrm{SO}_{4}^{2-} \) ?
(a) \( 4.0 \times 10^{-8} M \)
(b) \( 1.0 \times 10^{-6} \mathrm{M} \)
(c) \( 2.0 \times 10^{-8} \mathrm{M} \)
(d) \( 4.0 \times 10^{-6} \mathrm{M} \)
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