1a) A buffer solution contains 0.308 M ammonium bromide and 0.333 M ammonia. 

If 0.0266 moles of hydroiodic acid are added to 150 mL of this buffer, what is the pH of the resulting solution ? 

(Assume that the volume does not change upon adding hydroiodic acid)___ Ph

1b) A buffer solution contains 0.308 M hydrofluoric acid and 0.301 M sodium fluoride. 

If 0.0315 moles of perchloric acid are added to 250 mL of this buffer, what is the pH of the resulting solution? 

(Assume that the volume does not change upon adding perchloric acid)____Ph