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EX 2 Flashcards

1
Q

is simply water diffused in a relatively small quantity

A

MOISTURE

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2
Q

difficult to measure because of the complex intermolecular bonding properties within the substance matrix

A

WATER CONTENT

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3
Q

why is water content difficult to measure

A

due to intermolecular bonding

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4
Q

should be minimized in order to prevent decomposition of crude drug either due to chemical change or due to microbial contamination

A

moisture content

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5
Q

Is considered as Adulterant for it causes:
* Added weight
* Promotion of mold and bacterial growth
* Deterioration and spoilage of the drug

A

excessive moisture

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6
Q

____ moisture is not considered as excessive

A

5%

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7
Q

MOISTURE CONTENT

weight

A

increase

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8
Q

MOISTURE CONTENT

density

A

increase

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9
Q

MOISTURE CONTENT

viscosity

A

increase

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10
Q

MOISTURE CONTENT

electrical conductivity

A

promotes electrical conductance

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11
Q

two types of water present in drugs

A

water of crystallization
water in the absorbed form

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12
Q

definite proportion of water as part of drug’s crystalline structure

A

water of crystallization

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13
Q

water present in the surface (internal and external) of the drug

A

water in the absorbed form

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14
Q

METHODS OF MOISTURE DETERMINATION

  • Calculation of loss of weight
  • Heating of sample at 105 °C
A

thermogravimetric method

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15
Q

METHODS OF MOISTURE DETERMINATION

THERMOGRAVIMETRIC METHOD:
calculation of ____

A

loss of weight

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16
Q

METHODS OF MOISTURE DETERMINATION

THERMOGRAVIMETRIC METHOD:
temp required in heating the sample

17
Q

METHODS OF MOISTURE DETERMINATION

  • Calculation of volume
  • Uses azeotropic distillation and toluene
A

volumetric method

18
Q

METHODS OF MOISTURE DETERMINATION

VOLUMETRIC METHOD:
calculation of ____

19
Q

METHODS OF MOISTURE DETERMINATION

VOLUMETRIC METHOD:
uses ____ and ____

A

azeotropic distillation
toluene

20
Q

METHODS OF MOISTURE DETERMINATION

quantitative reaction of water with iodine and sulfur dioxide in the presence of a low molecular weight alcohol (e.g. methanol) and an organic base (e.g. pyridine)

A

titrimetric (karl fischer) methof

21
Q

LAB PROCEDURE

the leaves should be in ____mm thickness

22
Q

LAB PROCEDURE

dry the sample at 105C for____ hours in the oven

23
Q

%MOISTURE CONTENT

A

g of fresh sample - g of dried sample / g of fresh sample x 100

24
Q

LAB PROCEDURE

IR MOISTURE ANALYZER:
set the temperature to 105C, the time to ____mins

PCOG LAB (24 decks)

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