ANALYSIS EXAM 1 IJNIP

Permanganometry

What is the titration method of potassium permanganate VS?

Complexometry

What is the titration method of disodium edetate VS?

Acidimetry

What is the titration method of HCL VS?

Volumetric precipitation

What is the titration method of silver nitrate?

Nonaqueous alkalimetry

What is the titration method of sodium methoxide?

Lower meniscus

In clear solution where do you read the meniscus?

Upper meniscus

In highly colored solution where do you read the meniscus?

Outliers

Values that is significantly different

Tromethamine

What is the primary standard of Hydrochloric acid and Sulfuric acid?

Potassium biphthalate

What is the primary syandard of perchloric acid and sodium hydroxide

Benzoic acid

What is the primary standard of sodium methoxide

Sodium chloride

What is the primary standard of silver nitrate

Calcium carbonate

What is the primary standard of edta?

Sodium oxalate

What is the primary standard of potassium permanganate?

Direct alkalimetry

What is the type of assay of tartaric acid?

Residual alkalimetry

Assay of aspirin is what type of assay?

Direct acidimetry

Assay of sodium bicarbonate is what type of assay?

Residual acidimetry

Zinc oxide is what type of assay?

Nh4

In kjeldahl method, you convert bound nitrogen into?

5 mg of water

Karl Fisher reagent – each milliliter of the reagent is equivalent of approximately

Volhard method

formation of soluble colored complex (reddish brown) at the end point in the presence of white precipitate (utilizes Ferric alum TS)

Fajans titration

precipitate is covered or colored with

indicator at the end point

Methyl red

When a weak alkali is titrated with a strong acid, use

Yellow

Malachite green in acid ?

Red precipitate

utilizes Potassium chromate

(K2CrO4) TS which forms a red

precipitate of silver chromate

upon contact with excess silver

nitrate.

Very dull red heat

500 to 550

Dull red heat

550 to 700

Bright red heat

800 to 1000

Yellow red heat

1000 to 1200

White heat

1200 to 1600

Adsorption indicators

these indicators are used in the analysis of

halides by direct titration with silver nitrate solution.

Blue

What is the end point of tetrabromophenolphthalein ethyl ester ts

0.1 N Sodium thiosulfate VS

What is the secondary standard used in 0.1 N BROMINE VS

Residual iodometric titration

What is the assay of phenol?

Manganese dioxide

In permanganometry the addition of sulfuric acid is used to prevent the formation of what?

Pink

What is the end point of permanganometry

Saponification value

the number of milligrams of potassium hydroxide

required to neutralize the free acids and saponify the esters

Disapperance of pink

What is the end point of saponification value?

Acid value

the number of milligrams of potassium hydroxide

necessary to neutralize the free acid in 1g of oil, fat, wax, resin,

balsam, or similar organic substances of complex composition.

Faint pink

What is the end point of acid value

Ester value

the number of milligrams of potassium hydroxide

required to saponify the esters in 1g of a fatty or volatile oil, fat,

wax, balsam, resin or similar substances.

Iodine value

the number of grams of iodine absorbed under

specified conditions by 100g of oil, fat, wax, or other substances

– This serves as a quantitative measure of the proportion of unsaturated

fatty acids present, both free and combined as esters, that have the

property of absorbing iodine.

Drying oil

usually above 120 since they contain a large proportion of

unsaturated fatty acids.

Nondrying oil

such as olive oil and almond oil, have relatively low iodine

numbers, below 100.

Semidrying oils

such as cottonseed oil and sesame oil, have intermediate

iodine values, between 100 to 120.

Animal fats

the iodine number is not very high, usually being less than 90

Disappearance of bluish black

End point of iodine value

Iodobromide hanus

Method I in iodine value

Iodochloride wijs

Method 2 in iodine value

Chloroform

is added to the flask at the beginning

to dissolve the fat/oil sample so the iodine reagent can reach the

double bonds

Acetyl value of fatty acids

the number of milligrams of potassium hydroxide required

to neutralize the acetic acid obtained by the saponification

of 1g of acetylated fatty acids.

Ligand

Molecule or ion having a lone electron pair that can be used

to form a bond to a metal ion (Lewis base).

Bases

Donate spair of electrons

Acid

Accept pairs of electrons

Lewis acid

They are electron pair acceptor

Lewis base

They are electron pair donor

Chelate

 A substance containing 2 or more donor groups may combine

with a metal to form a special type of complex

Chlorophyll and hemoglobin

naturally occurring chelates

involved in life processes of plants and animals

Edta

used to tie up or sequester iron and copper ions so that

they cannot catalyze the oxidative degradation of ascorbic acid

in fruit juices and in drug

Hydroxynaphthanol blue

indicator used, end point of clear

blue color.

Hydrochloric acid

solubilizes the calcium carbonate by

converting it to calcium chloride.

Sodium hydroxide

alkalinizes the solution to a pH of

about 13, so that the Ca-EDTA complex would be stable

and any magnesium which might be present as a

contaminant would not react

Masking agent

used to allow the determination of a metal in the presence of

another metal

Demasking agent

It releases metal ion from masking agent (e.g.

formaldehyde)

Auxillary complexing agent

It prevents the precipitation of the metal ion in the absence of

EDTA.