Question

Ammonia () is a weak base with a pK_b of 4.75. Its conjugate acid, ammonium () has a pK_a of 9.25. Set up a titration using 20.00 mL of to titrate 20.00 mL of aqueous ammonia solution.

Concentration of solution: 0.1044 M

Initial buret reading (mL): 0.00

Buret reading at equivalence pt (mL): 14.41

What is the:

(a) Moles of added at equivalence pt

(b) Moles of in sample

(c) concentration (mol/L)

(d) pH at the equivalence point

(e) pH at half the volume required to reach the equivalence point