GRAVIMETRIC METHOD

Question 1

Is the MEASUREMENT OF WIEGHT OF A SUBSTANCE in a sample or calculation of the weight of a substance in a sample from the weight of a chemically equivalent amount of some other substance.

Answer 1

GRAVIMETRIC ANALYSIS

Question 2

Is the SEPARATION by extraction, precipitation or other means of the constituent to be determined either in the natural state or in the form of a definite compound the composition of which is known to the analysts, and the weighing of the resulting products.

Answer 2

GRAVIMETRIC ANALYSIS

Question 3

Used in IGNITION of drugs and precipitates.

Answer 3

PLAIN CRUCIBLE

Question 4

in constant weight, Two consecutive weighings do not differ by __________ of substance taken for the DETERMINATION, the second weighing following an additional hour of drying

Answer 4

more than 0.5mg/g

Question 5

in constant weight, When two consecutive weighings AFTER HEATING & COOLING do not differ by _________

Answer 5

more than 0.2mg

Question 6

Used to maintain a DRY ATMOSPHERE for objects that might be affected by moisture or CO2.

Answer 6

DESSICATOR

Question 7

small sample = small product

Answer 7

LAW OF MASS ACTION

Question 8

greater solubility = lesser precipitate

Answer 8

SOLUBILITY PRODUCT PRINCIPLE

Question 9

other reagent that could produce the same product

Answer 9

COMMON ION EFFECT

Question 10

Is the SEPARATION BY EXTRACTION of the constituents in the natural state, and the weighing of the final product.

Answer 10

PHYSICAL METHOD

Question 11

Is the SEPARATION BY PRECIPITATION, ignition of a compound, electrolysis of the constituents in the form of a definite compound the composition of w/c is known to the analyst, & the weighing of the final product.

Answer 11

CHEMICAL METHOD

Question 12

Of a crude drug is generally taken to be the RESIDUE containing AFTER INCINERATION

Answer 12

ASH CONTENT

Question 13

the ash usually represents the ________ naturally occurring in the drug

Answer 13

INORGANIC SALTS

Question 14

Very dull red heat

Answer 14

500-550

Question 15

DULL RED HEAT

Answer 15

550-700

Question 16

Is the part of the total ash which is INSOLUBLE in diluted hydrochloric acid.

Answer 16

ACID INSOLUBLE ASH

Question 17

The ash content of chemical is determined by using NEGLIGIBLE AMOUNT (quantity not exceeding 500 µg or 0.5mg)

Answer 17

RESIDUE ON IGNITION

Question 18

Provides a means of determining the percentage of test material which is VOLATILIZED and driven off under the condition specified.

Answer 18

LOSS ON IGNITION

Question 19

Is the residue after the CARBONIZED MASS is treated with 1 mL of concentrated H2SO4 and further incinerated after evaporating off the H2SO4 under a hood.

Answer 19

SULFATED ASH

Question 20

Used to ensure uniformity of water content limits in the drug. Drugs official in the USP and N.F. contain varying quantities of water either as water of crystallization (hydrates) or as water in the adsorbed form.

Answer 20

WATER CONTENT DETERMINATION