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The solubility product of \( \mathrm{PbI}_{2} \) is \( 7.2 \times 10^{-9} \). The
P maximum mass of \( \mathrm{NaI} \) which may be added in 500

W \( \mathrm{ml} \) of \( 0.005 \mathrm{M}-\mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \) solution without any precipitation of \( \mathrm{PbI}_{2} \) is \( (\mathrm{I}=127) \)
(1) \( 0.09 \mathrm{~g} \)
(2) \( 1.2 \times 10^{-3} \mathrm{~g} \)
(3) \( 6 \times 10^{-4} \mathrm{~g} \)
(4) \( 1.08 \times 10^{-5} \mathrm{~g} \)
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