At a certain temperature, a saturated solution of \( \mathrm{Zn}(\mathrm{OH})_{2} \) has a \( \m...

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At a certain temperature, a saturated solution of \( \mathrm{Zn}(\mathrm{OH})_{2} \) has a \( \mathrm{pH} \) of 8.63. The value of \( K_{\text {sp }} \) of \( \mathrm{Zn}(\mathrm{OH})_{2} \) at this temperature is
(A) \( 4.0 \times 10^{-18} \)
(B) \( 3.9 \times 10^{-28} \)
(C) \( 3.9 \times 10^{-17} \)
(D) \( 2.0 \times 10^{-19} \)
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