The pKa of vitamin c (ascorbic acid) is 4.17.?

Question

1) The pKa of vitamin c (ascorbic acid) is 4.17. Could we determine the amount if vitamin C in orange juice by acid-base titration? Why or why not?

2) Could we determine the amount of vitamin C in a vitamin C tablet by acid-base titration. Why or why not?

3) Based on the stoichiometry given in equations 1 and 2, what do you expect the titer value of a .01000 M KIO3 solution to be?
[ titer = mg ASCORBIC ACID / mL of KIO3 ]

For # 3, that was exactly how the question was with no equations 1 or 2 either...so i guess the teacher made a mistake. sorry

And for # 1 and 2, I actually tried doing it myself first but got confused.

I actually do try to do my homework first and then get help, unlike many other people, but thanks for helping anyway.

This is actually a pre-lab so I can never find out how to do it in the lab book so I actually have to research this online.

Answer 1

You are setting a new low for lazy people on here--you don't even give equations 1 and 2 required for problem #3. But fine, I'll do 2/3 of your homework for you: a) no, because there are other acids in there. b) yes, because it's the only acid in there, and that's how it's actually done. c) put in the equations or consider doing your own homework.

Answer 2

Pka Of Ascorbic Acid

Answer 3

Ascorbic Acid Pka

Answer 4

This Site Might Help You.

RE:
The pKa of vitamin c (ascorbic acid) is 4.17.?
1) The pKa of vitamin c (ascorbic acid) is 4.17. Could we determine the amount if vitamin C in orange juice by acid-base titration? Why or why not?

2) Could we determine the amount of vitamin C in a vitamin C tablet by acid-base titration. Why or why not?

3) Based on the stoichiometry given...