Difference plot. A solution containing 3.96 mmol acetic acid plus 0.484 mmol HCI in 200 mL, of 0.10 M KC1 was titrated with 0.490 5 M NaOH to measure K. for acetic acid.

(a) Write expressions for the experimental mean fraction of proto-nation, n̅_H(measured), and the theoretical mean fraction of protonation, n̅_H(theoretical).

(b) From the following data, prepare a graph of n̅_H(measured) versus pH. Find the best values of pK_a and pK'_k by minimizing the sum of the squares of the residuals,

E[7H(measured) TH(theoretical)]. nH(theoretical).