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Pchem Lab > Activity 6 - Extraction Of Caffeine From Tea > Flashcards

Activity 6 - Extraction Of Caffeine From Tea Flashcards

1
Q

Molecular formula of caffeine

A

C8H10N4O2

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2
Q

Other names of caffeine

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

IUPAC name of caffeine

A

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

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4
Q

Density of caffeine

A

1.23 g/cm3

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5
Q

Boiling point of caffeine

A

178*C

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6
Q

Melting point of caffeine

A

235*C

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7
Q

Taste of caffeine

A

Bitter

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8
Q

Odor of caffeine

A

Odorless

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9
Q

Biological action of caffeine

A
  1. Cardiac stimulation
  2. Respiratory stimulation
  3. Diuretic effect
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10
Q

Classification of caffeine

A

CNS stimulant

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11
Q

Uses of caffeine

A
  1. Mild CNS stimulant

2. Headache, in combination of ergotamine tartrate

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12
Q

Color of DCM

A

Colorless

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13
Q

Melting point of DCM

A

96.7*C

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14
Q

Boiling point of DCM

A

39.6*C

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15
Q

Density of DCM

A

1.3266 g/cm3

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16
Q

Molecular formula of DCM

A

CH2Cl2

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17
Q

Other names of dichloromethane

A
  1. DCM
  2. Methylene chloride
  3. Methylene dichloride
  4. Solmethine
  5. Narkotil
  6. Solaesthin
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18
Q

Uses of dichloromethane

A
  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
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19
Q

Color of sodium sulfate

A

White

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20
Q

Odor of sodium sulfate

A

Odorless

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21
Q

Melting point of sodium sulfate

A

32.38*C

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22
Q

Boiling point of sodium sulfate

A

1.429*C

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23
Q

Density of sodium sulfate

A

2.664 g/cm3

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24
Q

Solubility of sodium sulfate in ethanol

A

Insoluble

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25
Q

Solubility of sodium sulfate in glycerol and hydrogen iodide

A

Soluble

26
Q

Molecular formula of sodium sulfate

A

Na2SO4

27
Q

Other names of sodium sulfate

A
  1. Sulfuric acid disodium salt
  2. Glauber’s salt
  3. Disodium sulfate
  4. Thenardite
  5. Sol mirabilis
  6. Mirabilite
28
Q

Uses of sodium sulfate

A
  1. Manufacture of detergents
  2. Used in kraft process of paper pulping
  3. Orally, an effective saline laxative
29
Q

Color of sodium carbonate

A

White

30
Q

Odor of sodium carbonate

A

Odorless

31
Q

Taste of sodium carbonate

A

Strong alkaline taste

32
Q

Melting point of sodium carbonate

A

34*C

33
Q

Density of sodium carbonate

A

2.54 g/cm3

34
Q

Solubility of sodium carbonate in alcohol

A

Insoluble

35
Q

Molecular formula of sodium carbonate

A

Na2CO3

36
Q

Other names of sodium carbonate

A
  1. Washing soda
  2. Soda ash
  3. Soda crystals
  4. Disodium carbonate
37
Q

Uses of sodium carbonate

A
  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
Q

White crystalline powder or glistening needles

A

Caffeine

39
Q

1 gram of caffeine dissolves in _________ of water

A

50 ml

40
Q

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

A

6 ml

41
Q

1 gram of caffeine dissolves in __________ alcohol

A

75 ml

42
Q

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

A

25 ml

43
Q

1 gram of caffeine dissolves in __________ chloroform

A

6 ml

44
Q

1 gram of caffeine dissolves in __________ ether

A

600 ml

45
Q

Caffeine is a naturally occurring __________ derivative.

A

Xanthine

46
Q

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

A

Adenosine

47
Q

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

A

Epinephrine

48
Q

Other substances found in tea leaves:

A
  1. Cellulose

2. Tannins

49
Q

Toxic dose of caffeine for adults

A

5-10 g

50
Q

Toxic dose of caffeine for children

A

3 g

51
Q

Solvent used in extraction of caffeine

A

Dichloromethane

52
Q

Colorless liquid (volatile)

A

Dichloromethane

53
Q

Odor of dichloromethane

A

Sweet aroma

54
Q

Miscibility of dichloromethane with water

A

Immiscible

55
Q

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

A

Miscible

56
Q

Natural sources of dichloromethane

A
  1. Volcanoes
  2. Oceanic sources
  3. Macro-algae
57
Q

Drying agent used in extraction of caffeine

A

Sodium sulfate

58
Q

White crystalline solid

A

Sodium sulfate

59
Q

1 gram of sodium sulfate dissolves in __________ water

A

1.5 ml

60
Q

White powder (hygroscopic)

A

Sodium carbonate

61
Q

1 gram of sodium carbonate dissolves in __________ water

A

3 ml

62
Q

1 gram of sodium carbonate dissolves in __________ boiling water

A

1.8 ml

Pchem Lab (4 decks)

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