You weighed a solid sample of an unknown mixture of carbonate
and bicarbonate to be 5.3431 grams. You properly dissolved the
entire unknown solid sample in 250.0 mL of boiled and cooled
distilled water. You then performed two trials of 25.00 mL aliquot
of the unknown solution titrated with 0.1389 M standardized HCl
using a pH probe yielding: trial 1:{volume HCl (mL), pH} = {{1.090,
12.15}, {9.190, 12.13}, {17.290, 12.33}, {25.590, 12.35}, {33.800,
12.13}, {41.830, 12.30}, {49.990, 11.34}, {58.280, 7.10},...