Question Text
Scoring Scheme: 3-3-2-1
When you use the half
reaction method to balance
the redox reaction between
one mole of NBS and
ascorbic acid to give Ldehydroascorbic acid and
succinimide, how many
moles of electrons are
transferred?
Number of Moles of electrons
transferred =
Your Answer: 2 You Scored 3 p
Scoring Scheme: 3-3-2-1
How many moles of NBS are
consumed for every one
mole of ascorbic acid
reacted?
Your Answer: 1 You Scored 3 p
Scoring Scheme: 3-3-2-1
In the presence of excess
iodide ions, the iodine formed
by reaction of iodide with
NBS will react further to form
triiodide ions.
What does the triiodide
combine with to form the blue
color of the endpoint?
Your Answer: c. Starch You Scored 2 p
Data Entry - No Scoring
You were instructed to use
approximately 100 mg of
ascorbic acid to prepare your
primary standard solution.
Enter the precise mass in
milligrams of the ascorbic
acid used to prepare your
primary standard solution:
Your Answer: 100 No Points Poss
Scoring Scheme: 3-3-2-1
If one had weighed out
precisely 100 mg of ascorbic
acid for the primary standard
solution and dissolved it in
enough deionized water to
make a 250 mL solution, the
molarity of that solution
would be 0.00227 M