BACK TITRATION OF ASCORBIC ACID For the standardization, 5 ml of KIO3 was added, as well...

BACK TITRATION OF ASCORBIC ACID

For the standardization, 5 ml of KIO₃ was added, as well as 0.5087 g of solid KI and 2.5 mL of 0.5 M H2SO4. It was titrated with the Na2S2O3 solution previously prepared.

0.01 M KIO3 (+excess KI and acid) 0.07 M Na2S2O3

1- Calculate the ascorbic acid concentration from your manual titration. (HOW TO CALCULATE THE EXCESS IODINE)

IO₃^- + 8I^- + 6H⁺ ?3I ₃^-+ 3H2 O

I₃^- + 2S₂O₃^-2 ? 3I^- +S₄ O₆^-2

C₆H₈O₆ + I₃^- ? C₆H₆O₇ + 4H⁺ +3I^-

Standardization of Thiosulfate solution

Trial	KI mass (g)	Thiosulfate added (ml)	KIO₃ (ml) (0.01M)
1	0.5087	3.610	5 ml

analysis of ascorbic acid

trial	Ascorbic acid (g)	KI (g)	KIO₃ (ml)	Thiosulfate added (ml)
Manual titration	0.1504	0.5002	15	2.360

Expert Solution

queen_honey_blossom answered 1 hour ago

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