MIDTERM 23 - Tannins

Question 1

Are mixtures of polyhydroxy phenolic compounds which are difficult to separate because they do not crystallize

Answer 1

Tannins

Question 2

Are commonly used as astringent, antidote to alkaloidal poisoning, tanning, and dyeing industry

Answer 2

Tannins

Question 3

Hamamelis (Scientific name)

Answer 3

Hamamelis virginiana

Question 4

Hamamelis (Family)

Answer 4

Hamamelidaceae

Question 5

Hamamelis (Constituent)

Answer 5

Hamamelitannin

Question 6

Used as an astringent and for its hemostatic effect (Tannin plants)

Answer 6

Hamamelis

Question 7

Nutgalls (Scientific name)

Answer 7

Quercus infectoria

Question 8

Nutgalls (Family)

Answer 8

Fabaceae

Question 9

Nutgalls (Common name)

Answer 9

Turkish Syrian or Aleppo galls

Question 10

Nutgalls (Constituent)

Answer 10

Gallotannin

Question 11

Goldbeater’s skin test/Skin tanning test (2 composition)

Answer 11

25% HCl, 15% solution of ferrous SO4

Question 12

Goldbeater’s skin test/Skin tanning test (Positive result)

Answer 12

Brown/black color

Question 13

Gelatin test (Composition)

Answer 13

10% gelatin solution

Question 14

Gelatin test (Positive result)

Answer 14

White ppt

Question 15

Test with phenazone (2 composition)

Answer 15

0.5 g sodium acid phosphate, 2% phenazone solution

Question 16

Test with phenazone (Positive result)

Answer 16

All tannins are precipitated (Bulky and often colored)

Question 17

Test with ferric chloride (Composition)

Answer 17

5% ferric chloride

Question 18

Test with ferric chloride (Positive result)

Answer 18

Bluish-black color (Hydrolyzable tannins), Greenish brown (Non-hydrolyzable tannins)

Question 19

Test with bromine water (Composition)

Answer 19

Bromine water solution

Question 20

Test with bromine water (2 positive results)

Answer 20

Do not form any ppt (Hydrolyzable tannins), Buff colored ppt (Non-hydrolyzable tannins)

Question 21

Test for chlorogenic acid (Composition)

Answer 21

Ammonia

Question 22

Test for chlorogenic acid (Positive result)

Answer 22

Green color

Question 23

Test with lead nitrate (Composition)

Answer 23

5% lead nitrate

Question 24

Test with lead nitrate (Positive result)

Answer 24

White ppt

Question 25

Test with iodine (Composition)

Answer 25

Iodine solution

Question 26

Test with iodine (Positive result)

Answer 26

Red color

Question 27

Test with nitric acid (Composition)

Answer 27

Nitric acid

Question 28

Test with nitric acid (Positive result)

Answer 28

Red to yellowish color