I'm doing a lab report determination of ascorbic acid in vitaminC tablet.
The equation used are: IO3- + 8I- + 6 H+ <--> 3 I3- + 3H2O
Back titration with thiosulfate: 2S2O3-2 + I3---> S4O62- + 3I-
This is my value from the lab:
Mass of Na2S2O3 (g) : 7.8459 g ; Mass of KIO3 (g) : 2.5272 g
Mol of KIO3 dispensed: 0.01181 mol
Mass of tablet: 0.5986 g; mass of pulverized tablet: 0.5708g
Volume of thiosulfate dispensed (mL): 29.9 mL
So far I calculated:
Mol thiosulfate: 0.002100 mol (not sure if its right)
Now I need to figure out how to find:
Mol of IO3- consumed by thiosulfate?
Mol of IO3- consumed by vitamin C?
Mol of ascorbic acid?
How do I find those?
