Figure out whether the pH increases, decreases, or stays the same when the first substance mentioned in each of the multiple choices is added to a solution of the second substance, and then pick the correct statement.
a) When H₂C₂O₄ is added to a solution of NaHC₂O₄ the pH stays the same.
b) When (CH₃NH₃) is added to a solution of CH₃NH₂ the pH stays the same.
c) When K₂C₂O₄ is added to a solution of H₂C₂O₄ the pH stays the same.
d) When nitric acid is added to a solution of sodium nitrate the pH stays the same.
e) When NaCIO₄, is added to a solution of NaOH the pH stays the same.