9. 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 many moles of
H
+
are added?
a) 0.100 moles
b) 0.100 M x 0.0250 L = 0.0025 moles
c) 0.100 M x 0.0150 L = 0.0015 moles
d) 0.100 M x 0.0400 L = 0.0040 moles
