The water used in this experiment is sparged with nitrogen to remove any dissolv

Question

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: O2 + 4H+ + 4 e= --> 2 H2O

a. (3 points) Explain why sparging a solution with N2 to remove dissolved oxygen is an equilibrium process.

b. Using the half reaction above, write the balanced equation for the reaction of ascorbic acid with oxygen. Show your work.

c. If you didn’t know whether or not O2 is capable of oxidizing ascorbic acid, how 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

N2 will increase its concentration

It also favour the equilibrium to form O2(g) instead of O2(aq)

so the equilibrium shift toward O2(g) , which is gasoues, so it will go to the top gas

b)

ascorbic acid with oxygen

C6H8O6 + O2 --> C6H6O6 + H2O2

O2 + 4H+ + 4 e= --> 2 H2O

c)

Oxygen IS capable of oxidizing ascorbic acid, since the OH groups will be substituted for C=O groups, which are the most oxidized state of organic carbons

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