Activity 6 - Extraction Of Caffeine From Tea Flashcards Preview

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Flashcards in Activity 6 - Extraction Of Caffeine From Tea Deck (62):
1

Molecular formula of caffeine

C8H10N4O2

2

Other names of caffeine

1. Guaranine
2. Methyltheobromine
3. 1,3,7-Trimethylxanthine
4. Theine

3

IUPAC name of caffeine

1,3,7-Trimethylpurine-2,6-dione

4

Density of caffeine

1.23 g/cm3

5

Boiling point of caffeine

178*C

6

Melting point of caffeine

235*C

7

Taste of caffeine

Bitter

8

Odor of caffeine

Odorless

9

Biological action of caffeine

1. Cardiac stimulation
2. Respiratory stimulation
3. Diuretic effect

10

Classification of caffeine

CNS stimulant

11

Uses of caffeine

1. Mild CNS stimulant
2. Headache, in combination of ergotamine tartrate

12

Color of DCM

Colorless

13

Melting point of DCM

96.7*C

14

Boiling point of DCM

39.6*C

15

Density of DCM

1.3266 g/cm3

16

Molecular formula of DCM

CH2Cl2

17

Other names of dichloromethane

1. DCM
2. Methylene chloride
3. Methylene dichloride
4. Solmethine
5. Narkotil
6. Solaesthin


18

Uses of dichloromethane

1. As a paint stripper and a degreaser
2. In foods, used to decaffeinate coffee and tea as well as to prepare extracts of hops and other flavorings.
3. As an aerosol spray propellant
4. As a blowing agent for polyurethane foams

19

Color of sodium sulfate

White

20

Odor of sodium sulfate

Odorless

21

Melting point of sodium sulfate

32.38*C

22

Boiling point of sodium sulfate

1.429*C

23

Density of sodium sulfate

2.664 g/cm3

24

Solubility of sodium sulfate in ethanol

Insoluble

25

Solubility of sodium sulfate in glycerol and hydrogen iodide

Soluble

26

Molecular formula of sodium sulfate

Na2SO4

27

Other names of sodium sulfate

1. Sulfuric acid disodium salt
2. Glauber's salt
3. Disodium sulfate
4. Thenardite
5. Sol mirabilis
6. Mirabilite

28

Uses of sodium sulfate

1. Manufacture of detergents
2. Used in kraft process of paper pulping
3. Orally, an effective saline laxative

29

Color of sodium carbonate

White

30

Odor of sodium carbonate

Odorless

31

Taste of sodium carbonate

Strong alkaline taste

32

Melting point of sodium carbonate

34*C

33

Density of sodium carbonate

2.54 g/cm3

34

Solubility of sodium carbonate in alcohol

Insoluble

35

Molecular formula of sodium carbonate

Na2CO3

36

Other names of sodium carbonate

1. Washing soda
2. Soda ash
3. Soda crystals
4. Disodium carbonate

37

Uses of sodium carbonate

1. Used in the manufacture of glass
2. Used as a strong base
3. Used as a pharmaceutical aid used as an alkalizing agent
4. Used as a water softener and helps laundry detergents to lather more effectively, particularly when the water in which the laundry is being washed is hard.
5. Used as an additive swimming pools to neutralize the corrosive effects of chlorine and raise the pH
6. Used as a primary standard for acid-base titrations because it is solid and air stable, making it easy to weigh accurately.

38

White crystalline powder or glistening needles

Caffeine

39

1 gram of caffeine dissolves in _________ of water

50 ml

40

1 gram of caffeine dissolves in __________ water at 80*C

6 ml

41

1 gram of caffeine dissolves in __________ alcohol

75 ml

42

1 gram of caffeine dissolves in __________ alcohol at 60*C

25 ml

43

1 gram of caffeine dissolves in __________ chloroform

6 ml

44

1 gram of caffeine dissolves in __________ ether

600 ml

45

Caffeine is a naturally occurring __________ derivative.

Xanthine

46

Due to the structural similarity to __________, caffeine binds to and blocks __________ receptors, thereby preventing the inhibitory effects of __________ on nerve cells.

Adenosine

47

Caffeine leads to stimulation of medullary, vagal, vasomotor, and respiratory centers in the brain; and the release of __________.

Epinephrine

48

Other substances found in tea leaves:

1. Cellulose
2. Tannins

49

Toxic dose of caffeine for adults

5-10 g

50

Toxic dose of caffeine for children

3 g

51

Solvent used in extraction of caffeine

Dichloromethane

52

Colorless liquid (volatile)

Dichloromethane

53

Odor of dichloromethane

Sweet aroma

54

Miscibility of dichloromethane with water

Immiscible

55

Miscibility of dichloromethane in acetate, alcohol, benzene, ether, CHCl3

Miscible

56

Natural sources of dichloromethane

1. Volcanoes
2. Oceanic sources
3. Macro-algae

57

Drying agent used in extraction of caffeine

Sodium sulfate

58

White crystalline solid

Sodium sulfate

59

1 gram of sodium sulfate dissolves in __________ water

1.5 ml

60

White powder (hygroscopic)

Sodium carbonate

61

1 gram of sodium carbonate dissolves in __________ water

3 ml

62

1 gram of sodium carbonate dissolves in __________ boiling water

1.8 ml