1. 1. The pH of a solution is 4.44 ±0.04. Find [H+] and its absolute uncertainty.

2. Twelve dietary iron tablets were analyzed by the gravimetric procedure and the final mass of Fe2O3 (FM 159.688) was 0.2774 ±0.0018 g. Find the average mass of Fe per tablet. (Relative uncertainties in atomic masses are small compared with relative uncertainty in the mass of Fe2O3. Neglect uncertainties in atomic masses in this
problem).

3. A standard serum sample containing 102 meq chloride was analyzed by coulometric titration with silver ion. Duplicate results of 101 and 98 meq/L are obtained. Calculate:
a. mean value
b. the absolute error of the mean
c. the relative error in percent.

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yiven pH 444 004 3D now that pH log CH H 10PH 10 363 ... View the full answer