First slide

Acidic buffer

Question

A solution is prepared by mixing 100 ml of 0.1M NH₄OH and 200 ml of 0.2M NH₄Cl. pKb of NH₄OH is 4.8. Then the pH of the solution is

Moderate

Solution

The P^OHof a basic buffer is given as,
$\large {P^{OH}} = {P^{Kb}} + \log \frac{{\left[ {Salt} \right]}}{{\left[ {Acid} \right]}}\$
$\large {P^{OH}} = 4.8 + \log \frac{{\frac{{200 \times 0.2}}{{300}}}}{{\frac{{100 \times 0.1}}{{300}}}}\$
$\large {P^{OH}} = 4.8 + \log \frac{{40}}{{10}}\$
$\large \begin{gathered} {P^{OH}} = 5.4 \ \\ {P^H} = 14 - 5.4 \\\ \end{gathered} \$
$\large {P^H} = 8.6\$

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