In this experiment, we are going to use a back titr ation to determine the amoun

Question

In this experiment, we are going to use a back titration to determine the amount of ascorbic acid, C6H8O6, (Vitamin C, Figure 1) in a commercially available tablet. Ascorbic acid is oxidized by the triiodide ion (I3-) to produce dehydroascorbic acid.This is accomplished through the reaction of the iodate ion with iodide ion in an acidic medium

2· (3 points) would it be a good idea to use acetic acid (CH3COOH) instead of sulfuric acid (H2SO4) to set up the experiment? Why or why not? 3. The water used in this experiment is sparged with nitrogen to remove any dissolved oxygen. The proton-coupled reduction of oxygen is shown in the following half reaction: a. (3 points) Explain why sparging a solution with N2 to remove dissolved oxygen is an b. (4 points) Using the half reaction above, write the balanced equation for the reaction of c. (4 points) If you didn't know whether or not 02 is capable of oxidizing ascorbic acid, how equilibriun process. ascorbic acid with oxygen. Show your work would you determine this by consulting data? What data would you consult and what would you look for? (Simply trying the reaction is not an acceptable answer.)

Explanation / Answer

Answer :

Idea of using acetic acid rather than H2SO4 is better ,beacause of derivative products of acetic acid are huge.

sparging is a technique which involves bubbling a chemically inert gas, such as nitrogen, argon, or helium, through a liquid. This can be used to remove dissolved gases (e.g. oxygen) from the liquid.

O3+H4+N2----------------> 2H2O+N2O

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