\( 20 \mathrm{~mL} \) of \( 0.1 M \) weak acid \( \mathrm{H} A\left(K_{a}=10^{-5}\right) \) is m...

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\( 20 \mathrm{~mL} \) of \( 0.1 M \) weak acid \( \mathrm{H} A\left(K_{a}=10^{-5}\right) \) is mixed with solution of \( 10 \mathrm{~mL} \) of \( 0.3 \mathrm{MHCl} \) and 10 \( \mathrm{mL} \) of \( 0.1 \mathrm{M} \mathrm{NaOH} \). Find the value of \( \left[A^{-}\right] /\left([\mathrm{H} A]+\left[A^{-}\right]\right) \)in the resulting solution :
(a) \( 2 \times 10^{-4} \)
(b) \( 2 \times 10^{-5} \)
(c) \( 2 \times 10^{-3} \)
(d) \( 0.05 \)
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