a)
True value of pH= 4.00
pH meter reading = 3,70
Thus, % error in pH is -7.5%
b)
We know that the concentration of Hydronium ion is related to pH as,
Actual concentration,
pH meter concentration,
Percentage error,
Thus, the % error in [H3O+] is 99.5%
c)
Acetic Acid is a weak acid. Thus, the acid dissociation constant is given as,
The Ka is given as,
For actual Ka
For measured reading,
% Error in Ka
Thus, we see that a pH error of -7.5% can translate into error in measuring [H3O+] by approx 99.5% and that of Ka by approx 299%
Student Name: Instructor Name: 3. A poorly calibrated pH meter yields a pH of 3.70 when...
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