(Green) Redox titration of Absorbic Acid

Question 1

Why did they change the experiment?

Answer 1

To eliminate environmental impact (chromium) and to cut disposal costs

Question 2

Goals of the experiment:

Answer 2

1. Redox titrations
2. Use a rapid reaction of known stoichiometry
3. Determine endpoint, visual and potentiometric

Question 3

12 Principles of Green Chemistry

Answer 3

1. Prevention (waste)
2. Atom Economy, if you use it it should end up in the final product
3. Less Hazardous chemical synthesis
4. Design safer chemicals
5. Safer solvents and Auxiliaries
6. Energy efficiency
7. Use renewable feedstocks
8. Reduce derivatives
9. Catalysis (catalytic>stoichiometric)
10. Design for degradation
11. Real-time Analysis of pollution prevention
12. Inherently safer chemistry for Accident prevention

Question 4

What is Absorbic acid?

Answer 4

Vitamin C

Question 5

RDA for absorb acid in adults?

Answer 5

75-90 mg/day (smokers=more)

Question 6

What did we titrate the absorbed acid with?

Answer 6

Iodine (I3^-), an oxidizing agent. We simplify to I2.

Question 7

The reaction equation?

Answer 7

C6H8O6 + I2 —> C6H8O6 + 2HI

Question 8

What is oxidized in the reaction? What’s reduced?

Answer 8

Absorbic acid (carbon) is oxidized and the iodine (I2) is reduced

Question 9

What indicator did we use? What color will it turn at the end?

Answer 9

Starch; blue-black at the end point. Oxidizes that shit

Question 10

Is the redox reaction spontaneous or non spontaneous?

Answer 10

Spontaneous

Question 11

Should it be more difficult for the iodine to oxidize the absorbed acid or the indicator?

Answer 11

The indicator

Question 12

We want to determine the amount of ____ in the sample.

Answer 12

Fe(II) ions

Question 13

VItamin c is involved in…

Answer 13

collagen synthesis, protein metabolism, iron absorption, and the healing of wounds

Question 14

Vitamin c can be synthesized in your body if needed. True/false?

Answer 14

False