The Kb of ammonia is 1.77x10^-5.?

The pH of a buffer prepared by combining 50mL of 1.00M ammonia and 50mL of 1.00M ammonium nitrate is____?

Answer:
There is a short cut here.

you have equal concentrations of NH3 and NH4(+). Thus, the pH = the pKa of the acid.

You're given the Kb, so you need to find the Ka

that's Ka = 1.0E-14 / Kb = 1.0E-14 / 1.77E-05

Then take the -log(Ka) to get the pKa.

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