ViA SG2216 Assignment08_Hx D Including activity coeffici X VA 8-table-01.pdf C C
ID: 1049011 • Letter: V
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ViA SG2216 Assignment08_Hx D Including activity coeffici X VA 8-table-01.pdf C Chegg.com C O www.webassign.net/web/Student/Assignment-Responses/last?dep-14204279 My Notes Ask Your Teacher 7. -7 points (a) The measured pH of 0.100 M HCl at 25 C is 1.092. From this information, calculate the activity coefficient of H+ and compare your answer with that in the activity coefficients table The experimental value is 4.0 Differences 2% are considered significant, which means that the experimental value is Select v the tabular value of 4.0D (b) The measured pH of 0.0700 M HCl 0.0300 M KCl at 25 C is 1.256. From this information, calculate the activity coefficient of H+ n this solution 4.0 (c) The ionic strengths of the solutions in parts (a) and (b) are the same. What can you conclude about the dependence of activity coefficients on the particular ions in a solution? The activity coefficient depends somewhat on the identity of the counterions in solution The activity coefficient does not depend on the identity of the counterions in solutionExplanation / Answer
pH and activity coefficient
(a) measured pH = 1.092
pH = -log([H+](activity coefficient H+))
1.092 = -log(0.1) x (activity coefficient H+)
activity coeficient of [H+] = 0.81
The experimental value of equal to or greater than 2% is significant, that means experimental value is 2% greater than tabulated value.
(b) pH = 1.256
1.256 = -log(0.07 x (activity coefficient H+))
(activity coefficient H+) = 0.792
(c) The ionic strength of (a) and (b) solutions are the same. This tells us that,
- The activity coefficient does not depend upon the identity of the counterions in solution.
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