Buffers

Buffer…. Weak acid + its conjugate base Or Weak base + its conjugate acid

Which of following pairs make a buffer? A. NH3, NH4Cl B. RbOH, HBr C. KOH, HF D. NaC2H3O2, HCl

To review: Directly add Weak acid + weak base conjugate pair Or Indirectly by Weak acid + strong base (and it will make the weak form the needed conjugate) or weak base + strong acid (and it will make the weak form the needed conjugate)

Calculate the pH of a buffer solution that contains 0 Calculate the pH of a buffer solution that contains 0.15M of acetic acid and 0.20mol of sodium acetate in 1L. (Ka =1.8 x 10-5) Solve by icebox then solve by Henderson hasselbach HC2H3O2 H+ + C2H3O2-

ph = 4.87