Practice question
Question
A weak base NH₃ ( Kb = 1.8 × 10⁻⁵ ) is mixed with 0.02 M NH₄Cl in a 1:1 volume ratio. If the final [NH₃] = 0.05 M , what is the pH?
Explanation
[NH₄+] = 0.01 M , pKb = 4.74 , pOH = 4.74 + log (0.01/0.05) = 4.74 - 0.7 = 4.04 , pH = 14 - 4.04 = 9.96 .
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