10. For the strong acid-weak base titration of ammonia by hydrochloric acid, find the pH after 15.0 mL of 0.100 M HCl has been added to 25.0 mL of 0.100 M NH
3
solution. (
K
b
= 1.8 x 10
-5
)
How do these two species react?
a) they react completely to form
NH
4
+
with
NH
3
in excess
b) they react completely to form
NH
4
+
with
H
+
in excess
c) they react to form
NH
4
+
but neither is used up
