Determine \( \mathrm{pH} \&\left[\mathrm{NH}_{4}{ }^{+}\right] \)in...

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Determine \( \mathrm{pH} \&\left[\mathrm{NH}_{4}{ }^{+}\right] \)in a solution obtained by mixing equal volumes of \( 0.02 \mathrm{M} \mathrm{KOH} \) solution and \( 0.2 \) \( \mathrm{M} \mathrm{NH}_{3} \cdot \mathrm{H}_{2} \mathrm{O} \) solution \( \left(\mathrm{K}_{\mathrm{b}}=2 \times 10^{-5}\right) \). Also calculate \( \% \) dissociation of \( \mathrm{NH}_{3} \cdot \mathrm{H}_{2} \mathrm{O} \) in the final solution.
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