What is the pH of a solution prepared by mixing 50.00 mL of 0.10 M NH3 with 25.00 mL of 0.10 M NH4Cl? Assume that the volume of the solutions are additive and that Kb= 1.8 × 10-5 for NH3.

3 answers

The Henderson-Hasselbalch equation is
pH = pKa + log(base)/(acid)
Remember to change Kb to pKa.
pKa + pKb = pKw = 14
If you convert Kb to pKb you can use the above to convert that to pKa.

9.26

9.56

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