What will happen to the pH of the ff. after the addition of 0.1M HCl?

Question

:distilled water, 0.0001M HCl, 0.0001M NaOH, and acetate buffer..the same set of solutions will be used in the next question....What will happen to the pH of these solutions after the addition of 0.0001M NaOH? thank u!!!!

:distilled water, 0.0001M HCl, 0.0001M NaOH, and acetate buffer..the same set of solutions will be used in the next question....What will happen to the pH of these solutions after the addition of 0.0001M NaOH? thank u!!!!What does it mean?

Answer 1

if you add HCl, the pH decreases and in an opposite way, if you add NaOH, the pH increases