Experiment 2: Purification of Adipic Acid

Question 1

Adipic Acid Formula?

Answer 1

H2C6H8O4
Her 2 inch
cock 6
hates 8
orientals 4 me.

Question 2

Adipic acid is _____ in boiling water and only ______ in cold water

Answer 2

Very soluble; slightly soluble. Curve is an exponential, practically 0 for a long time than exponential increase.

Question 3

Adipic acid’s solubility allows for

Answer 3

Recrystallization, which leaves out impurities

Question 4

Oxidized compounds give a _____ color.

Answer 4

Brown

Question 5

Oxidized compounds are removed by….

Answer 5

Activated charcoal and filtration

Question 6

Important chemical uses for adipic acid include…

Answer 6

Nylon-6,6 , upholstery, carpet fibers, clothing, tires, and auto parts

Question 7

Industrial synthesis is bad because….

Answer 7

1) Uses cyclohexanol, cyclohexanone, benzene, and nitric acid
2) It produces Nitric Oxide (N2O), a greenhouse gas

Question 8

Procedure:

Answer 8

1) Dissolve crude adipic acid in boiling water
2) Remove and add activated charcoal
3) Return to boil.
4) Filter
5) Cool solution, allow crystallization
6) Filter
&) allow 2 weeks for colorless crystals to dry

Question 9

Calculation of Purity?

Answer 9

% recovery = weight of pure adipic acid/weight crude adipic acid

Question 10

Melting point of impure substance is..?

Answer 10

Broad and lower that literature values. Impurities interrupt normal intermolecular forces

Question 11

What property of adipic acid is used in this separation?

Answer 11

Solubility

Question 12

Weird questions w/o answers at end….

Answer 12

?

Question 13

Cool _____ to allow for large crystals.

Answer 13

slowly

Question 14

What impurities give adipic acid it’s brown color?

Answer 14

Fine carbon particles, present organic compounds

Question 15

Adipic acid solubility curve, temp vs. time?

Answer 15

_____////||||

Question 16

Impure substances have a ______ melting/freezing point than pure substances.

Answer 16

Lower