Question

What is the pH of a buffer solution prepared by adding 50.00 mL of a 0.20 M solution of NH4Cl (aq) to 50.00 mL of an 0.30 M NH3(aq) solution? (Kb (NH3) = 1.8 x 10-5)
a) 9.0
b) 9.1
c) 9.2
d) 9.4
e) more information is needed

Answer 1

here what is did using henderson hasselbalch:

ph= -log(5.5e-10) + log (.3/.2)

Answer 2

found the ka using kw/kb

Answer 3

i got 9.4, is that the right way?

Answer 4

yeah, its right. good job

Answer 5

thanks!