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Analytical Chem 2 > Special Methods 2 > Flashcards

Special Methods 2 Flashcards

1
Q

Number of physical and chemical properties of values

A

Constants

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2
Q

Constants are taken with

A

Odor
Taste
Color
Special identity tests

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3
Q

Acid Value

A

Acid Number
Acidity Index

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4
Q

The number of mg of KOH necessary to NEUTRALIZE the FREE ACID in 1g of oil, fat, wax, resin balsam

A

Acid Value/Acid Number/Acidity Index

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5
Q

Acid Value Formula

A

weight of sample

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6
Q

The number of mg of KOH required to SAPONIFY the ESTERS in 1g of fatty or volatile oil, fat, wax, balsam, resin

A

Ester Value

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7
Q

Application of Ester Value

A

Analysis of white and Yellow wax - indicate presence of adulterants such as Paraffin

Ex. Stearic Acid - Rosin

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8
Q

Ester Value Formula

A

EV = (Vb - Vt) x N x 56.11 / wt. sx

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9
Q

Saponification Value

A

Saponification Number, Koettsdofer Number

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10
Q

The number of mg of KOH to NEUTRALIZE free acids and SAPONIFY esters contained in 1g fat, fatty/volatile Oil, wax, resim, balsam

A

Saponification Value/Number

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11
Q

Application of Saponification Value

A

Detection of presence of GLYCERIDES of acids containing less than 16 or >18 carbon atoms

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12
Q

Saponification Value is __________ proportional to the mean MW of the acids present, also indicates ________ of the saple with ___________

A

Saponification Value is inversely proportional to the mean MW of the acids present, also indicates adulteration of the saple with unsaponifiable matter

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13
Q

Formula for Saponification Value

A

SV = (Vb - Vt) x N x 56.11
——————————
wt. sx

A.V + E.V

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14
Q

The substances present in OILS nad FATS that are not saponified by ALKALI hydroxides but soluble in ordinary FAT SOLVENTS

A

Unsaponifiable Matter

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15
Q

Unsaponifiable matter in Vegetable Oils and fats

A

Phytosterols

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16
Q

Unsaponifiable matter in Animal Oils and Fats

A

Cholesterols

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17
Q

The number of grams of iodine absorbed by 100g of oil, fat, & wax.

A

Iodine Number/Value

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18
Q

Iodine Number is a quantitative measure of proportion of __________ fatty acids

A

UNSATURATED fatty acids

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19
Q

Application of Iodine Number/Value

A

Identification of known oils
Determine purity of oils
Detect presence of adulterants and its nature

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20
Q

Olive Oil to Cottonseed Oil

A

Iodine Value

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21
Q

Methods used in determination of Iodine Value

A

Method I: Hanus Method - uses iodobromide in glacial acetic acid
Method II: Wijs Method - uses iodine monochloride in glacial acetic acid
Hubl: Unofficial - uses iodine mercuric chloride in Alcohol

22
Q

Method which uses iodobromide in glacial acetic acid

A

Hanus Method

23
Q

Method which uses iodine monochloride in glacial acetic acid

A

Wijs Method

24
Q

Method which uses iodine mercuric chloride in Alcohol

25
Formula for Iodine Value
(Vb - Vsx) x N x 0.1269 ------------------------------- x 100 Wt sx
26
Classification based on Iodine Value
Drying Oil Semi-Drying Oil Non-drying Oil
27
Drying Oils
>120 Linseed Oil Cod Liver Oil Fish Oil
28
Semidrying Oils
100-120 Cottonseed Oil Sesame Oil
29
Nondrying Oil
<100 Almond Oil Olive Oil
30
The number of mg KOH equivalent to the hydroxyl/OH content of 1g of a subs.
Hydroxyl Value/Number
31
Application of Hydroxyl Value
Indication of identity and purity of fatty substance with alcohol hydroxyl groups
32
Hydroxy Value is ______ proportional to the molecular weight
Inversely proportional
33
TF: Abnormally low value is indicative of adulteration with higher MW or eith Non-alcoholic fatty substances.
True
34
The number of mg of KOH required to neutralize the acetic acid obtained by the saponification of 1g of acetylated fatty acids.
Acetyl Value
35
Volatile Oils
Ethereal Oils Essential Oils Essences
36
Important chemical components of Volatile Oils
Hydrocarbons Alcohols Aldehydes Ketones Phenols Acids Sulfur compounds
37
Ratio of the weight of the volume of Oil to the equal volume of pure water at same temp and pressure
Specific Gravity
38
Apparatus used for Specific Gravity
Westphal Balance Pycnometer - Official
39
Temperature and Range values for Specific Gravity
25C 0.84 - 1.2
40
Oils lighter than water
Lemon Oil Turpentine oil Orange Oil Rosemary Oil Hydrocarbons, Alc, Ketones, Esters
41
Oils with spec. gravity greater than 1
Cinnamon oil Anise Oil Clove Oil Aldehydes Phenols Esters
42
Rotating power or power of rotating the plane polarized light
Rotary Power/Optical Activity
43
Apparatus used in Rotary Power/Optical Activity
Laurent half-shadow polarimeter
44
Should not be omitted in examination of volatile oils
Rotary Power
45
Detecting adulteration with inactive substances
Rotary Power
46
Apparatus used in Refractive Index
Abbe Refractometer
47
Refractive Index Temperature and Range
20C, except rose oil at 30C 1.46 - 1.61
48
Specific Assay for Alcohol Content
Method: Acetylization Apparatus: Acetylization Flask Reagent: Acetic anhydride Ex: Peppermint Oil
49
Specific Assay for Aldehyde Content
Method: Bisulfite Method Apparatus: Cassia Flask Reagent: Bisulfite Method: Hydroxylamine Apparatus: Erlenmeyer Flask Reagent: Hydroxylamine HCl Ex: Benzaldehyde
50
Specific Assay for Ketone Content
Method: Bisulfite, Hydroxylamine Apparatus: Cassia Flask Ex: Caraway Oil, Spearmint Oil
51
Specific Assay for Phenol Content
Method: W/ NaOH Apparatus: Cassia Flask Reagent: Caustic Alkali (KOH) Ex: Clove Oil

Analytical Chem 2 (17 decks)

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