more than one answer is possible, if correct i will rate!

A 1 liter solution contains 0.353 M hydrofluoric acid and 0.470 M sodium fluoride. Addition of 0.388 moles of sodium hydroxide will: (Assume that the volume does not change upon the addition of sodium hydroxide.) Raise the pH slightly Lower the pH slightly Raise the pH by several units Lower the pH by several units Not change the pH Exceed the buffer capacity Submit Answer Retry Entire Group 2 more group attempts remaining