17. 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 NH3 solution. (Kb = 1.8 x 10-5)

In question 16, we determined that the pH of the resulting solution is 9.08 by converting [OH-] to [H+] and then taking the negative log of the hydronium concentration.

What is another way of reaching the pH from [OH-]?

a) find the pOH by -log [OH-] and then subtracting from 14 (pKw) to get pH
b) find the [H+] by dividing [OH-] into 14 and taking the log of the quotient to get pH
c) -log [OH-]
d) there are no other ways of finding pH from [OH-]