pH of a buffer and buffer capacity( Continued) After addition of HCl, the new [ac]=0.09M, [Hac]=0. 11M m1=ka。Hg LAC 0.11 =10 -4.75 10 4.66 0.09 pH=46 ypH=475-4.66=0.09 The addition of 0.01M strong acid to pure water would lower ph by 5 units(from 7 to 2)pH of a buffer and buffer capacity (Continued) After addition of HCl, the new [Ac- ]=0.09M, [HAc]=0.11M 4.75 4.66 0.09 4.66 10 0.09 0.11 10 [ ] [ ] [ ] 4.7 5 4.6 6  = − = = = • = = • − − − + pH pH Ac HAc H Ka The addition of 0.01M strong acid to pure water would lower pH by 5 units (from 7 to 2)!