50 mL of 0.1M NH₄⁺ (weak acid) is titrated with 0.20M KOH (strong base). The Ka for NH₄⁺ is 5.6 x 10⁻¹⁰. Show your process for determining the following:
a. Write the chemical equation for this titration.
b. What volume of KOH is required to reach the equivalence point?
c. What is the pH at the equivalence point?