pH of a buffer and buffer capacity Example: For a buffer solution consisting of 0. 1 M acetic acid and o 1M sodium acetate the ph of the solution is 4.75. HAc=h+Ac Ka=LH IAc 1 [HAc] [H]=Ka· HAc] LAc =10-470.1 4.75 f an amount of hydrochloric acid, equivalent to 10% of the acetate present, is added to the buffer, what is the new pH of the solution?pH of a buffer and buffer capacity Example: For a buffer solution consisting of 0.1 M acetic acid and 0.1M sodium acetate, The pH of the solution is 4.75. 4.75 4.75 10 0.1 0.1 10 [ ] [ ] [ ] [ ] [ ][ ] − − − + + − + − = • = = • = = + Ac HAc H Ka HAc H Ac Ka HAc H Ac If an amount of hydrochloric acid, equivalent to 10% of the acetate present, is added to the buffer, what is the new pH of the solution?