What is the pH of a buffer system that contains 0.18M NH4+ and 0.14M NH3? The pKa of NH4+ is 9.25.

Answer 1

Use the Henderson-Hasselbalch equation.

Answer 2

2.0*10M

Answer 3

pH=pKa+log(base/acid)
pH= 9.25+log(0.14/0.18)
pH= 9.14