A buffer contains equal concentrations of NH₃ and NH₄Cl. If pKb of NH₃ is 4.74, what is the pH at 25 °C?
Correct answer D. 9.26
Explanation
For a basic buffer pOH = pKb + log([salt]/[base]) = 4.74 + log 1 = 4.74, so pH = 14 − 4.74 = 9.26.
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