What is the \( \left[\mathrm{OH}^{-}\right] \)in the final solution prepared by mixing \( 20.0 \...

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What is the \( \left[\mathrm{OH}^{-}\right] \)in the final solution prepared by mixing \( 20.0 \mathrm{~mL} \) of \( 0.050 \mathrm{M} \) \( \mathrm{HCl} \) with \( 30.0 \mathrm{~mL} \) of \( 0.10 \mathrm{M} \mathrm{Ba}(\mathrm{OH})_{2} \) ?
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