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Calculate \( \left[\mathrm{S}^{2-}\right] \) in a solution original having 0.1
P \( \mathrm{M}-\mathrm{HCl} \) and \( 0.2 \mathrm{M}-\mathrm{H}_{2} \mathrm{~S} \). For \( \mathrm{H}_{2} \mathrm{~S}, \mathrm{~K}_{\mathrm{al}}=1.4 \times 10^{-7} \)

W and \( \mathrm{K}_{\mathrm{a} 2}=1.0 \times 10^{-14} \).
(1) \( 0.1 \mathrm{M} \)
(2) \( 2.8 \times 10^{-20} \mathrm{M} \)
(3) \( 2.8 \times 10^{-22} \mathrm{M} \)
(4) \( 1.4 \times 10^{-20} \mathrm{M} \)
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