A 0.552-g sample of ascorbic acid (vitamin C) was dissolved in water to a total volume of 20.0 mL and titrated with 0.1103 M KOH, and the equivalence point occurred at 28.42 mL. The pH of the solution at 10.0 mL of added base was 3.72.
a) Make a rough sketch of the titration curve from this data by calculating the pH at the beginning of the titration, at one-half of the equivalence point, at the equivalence point, and at 5.0 mL beyond the equivalence point.
b) Pick a suitable indicator for this titration.
bromthymol blue
bromeresol purple
m-nitrophenol
phenolphthalein
o-cresolphthalein
alizarin