140 mL of a .175 M aqueous solution of NH3 is titrated with a .106 M solution of HCl. (NH4+ Ka=5.56x10^-10)
What is the pH:
a. before any HCl is added?
b. after 20 mL of HCl is added?
c. at the half equivalence point?
d. at the equivalence point?
e. at 1.00 mL of HCl past the equivalence point?