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The \( \mathrm{pH} \) of an aqueous solution of \( \mathrm{Ba}(\mathrm{OH})_{2} \) is 10 .
P If the \( \mathrm{K}_{\mathrm{sp}} \) of \( \mathrm{Ba}(\mathrm{OH})_{2} \) is \( 1 \times 10^{-9} \),

W then the concentration of \( \mathrm{Ba}^{2+} \) ions in the solution in \( \mathrm{mol} \mathrm{L}^{-1} \) is
(1) \( 1 \times 10^{-2} \)
(2) \( 1 \times 10^{-4} \)
(3) \( 1 \times 10^{-1} \)
(4) \( 1 \times 10^{-5} \)
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