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An aqueous solution of a metal bromide \( \mathrm{MBr}_{2} \)
P \( (0.04 \mathrm{M}) \) is saturated with \( \mathrm{H}_{2} \mathrm{~S} \). What is the minimum

W \( \mathrm{pH} \) at which \( \mathrm{MS} \) will precipitate? the value of \( \mathrm{K}_{\mathrm{sp}} \) for \( \mathrm{MS}=6.0 \times 10^{-21} \); concentration of saturated \( \mathrm{H}_{2} \mathrm{~S}=0.1 \mathrm{M}, \mathrm{K}_{1}=10^{-7} \) and \( \mathrm{K}_{2}=1.5 \times 10^{-13} \) for \( \mathrm{H}_{2} \mathrm{~S} \).
(1) 1.0
(2) 1.3
(3) 13.0
(4) 0.7
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