What is the \( \left[\mathrm{OH}^{-}\right] \)in the final solution prepared by mixing \( 20 \ma...

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What is the \( \left[\mathrm{OH}^{-}\right] \)in the final solution prepared by mixing \( 20 \mathrm{ml} \) of \( 0.05 \mathrm{M} \mathrm{HCl} \) with \( 30 \mathrm{ml} \) of \( 0.1 \mathrm{M} \mathrm{Ba}(\mathrm{OH})_{2} \) ?
(A) \( 0.4 \mathrm{M} \)
(B) \( 0.005 \mathrm{M} \)
(C) \( 0.12 \mathrm{M} \)
(D) \( 0.1 \mathrm{M} \)
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