VOLUMETRIC ANALYSIS

Question 1

the determination of the
volume of a solution of
known concentration
required to react with a
given amount of a
substance to be analyzed.

Answer 1

Volumetric
Analysis

Question 2

What is the importance of
volumetric analysis?

Answer 2

It is used in
determining the
purity of drugs

Food industry –
determination of
salt, vit and fatty
acid content.

Water treatment
– determination
of contaminants
and pH

Question 3

a common laboratory method of quantitative chemical
analysis where a solution of known concentration is used
to determine the concentration of an unknown solution.

Answer 3

TITRATION

Question 4

Parts of a titration set-up

Answer 4

1. Analyte/Titrand
2. Standard solution/ Volumetric Solution/ Titrant
3. Indicator

Question 5

a solution which
concentration is
accurately known.

Answer 5

Standard solution

Question 6

the
chemical substance
being analyzed or the
active constituent in
the sample.

Answer 6

Analyte

Question 7

a chemical
which changes
color at or very
near the endpoint.

Answer 7

Indicator

Question 9

point during a titration when an indicator shows that
the amount of reactant necessary for a complete
reaction has been added to a solution

Answer 9

Endpoint (practical

Question 9

s the theoretical point at which equivalent amounts
of each substance have reacted

Answer 9

Equivalence point or stoichiometric point or
theoretical endpoint

Question 9

reaction between an acid and
a base to form salt of water

Answer 9

Neutralization

Question 10

reactions that from an
insoluble precipitate

Answer 10

Precipitimetry

Question 11

reaction between metal ions
and a ligand

Answer 11

Complexometry

Question 12

reaction that involves the
transfer of electrons

Answer 12

Redox titration

Question 13

Chemical substance, which changes color at or
very near the endpoint.

Answer 13

INDICATORS

Question 14

Used to avoid errors during titration

Answer 14

INDICATORS

Question 15

INDICATORS Referred to as

Answer 15

TS or Test Solutions

Question 16

TS or Test Solutions Usual concentration is

Answer 16

0.05%, with 0.1 to 0.2 ml
of indicator used for 10 ml of the analyte

Question 17

pH range; Acid; Base
Malachite green

Answer 17

0 – 2.0; Yellow; Green

Question 18

pH range; Acid; Base
Methyl orange

Answer 18

3.2 -4.4 Pink Yellow

Question 19

pH range; Acid; Base
Methyl red

Answer 19

4.2 – 6.2 Red Yellow

Question 20

pH range; Acid; Base
Bromothymol
blue

Answer 20

6.0 – 7.6 Yellow Blue

Question 21

pH range; Acid; Base
Phenolphthalein

Answer 21

8 - 10 Colorless Pink or red

Question 22

pH range; Acid; Base
Thymol blue

Answer 22

8 – 9.2 yellow blue

Question 23

Weak Acid Strong Base INDICATOR

Answer 23

Phenolphthalein

Question 24

Weak Base Strong Acid INDICATOR

Answer 24

Methyl red

Question 25

Strong Acid Strong Base INDICATOR

Answer 25

Phenolphthalein, Methyl Orange, Methyl Red

Question 26

Weak Base Weak Acid INDICATOR

Answer 26

NONE – No endpoint

Question 27

PRECIPITATION INDICATORS

Answer 27

* Dichlorofluororesc ein * Eosin Y * Potassium Chromate * FAS

Question 28

COMPLEXATION INDICATORS

Answer 28

* Dithizone * Eriochrome Black * Hydroxynaphtol Blue

Question 29

REDOX INDICATORS

Answer 29

* Iodine TS * Potassium Permangana te VS * Starch TS

Question 30

number of moles of reactive unit in a compound which reacts or takes the place of one mole of Hydrogen ion

Answer 30

Equivalent

Question 31

Equivalent of salts

Answer 31

Valence of cation

Question 32

weight that is chemically equivalent to the reacting power of one of one atomic weight of hydrogen.

Answer 32

Equivalent weight

Question 33

called milliequivalent weight

Answer 33

1/1000 of Eq. weight

Question 34

strength in grams equivalent to milliliter of standard solution or the weight of a substance chemically equivalent to 1 ml of a standard solution.

Answer 34

TITER

Question 35

no. of equivalents of solute per liter

Answer 35

NORMALITY

Question 36

1N

Answer 36

NORMAL SOLUTION

Question 37

2N

Answer 37

DOUBLE NORMAL

Question 38

0.5N

Answer 38

HALF NORMAL

Question 39

TENTH NORMAL

Answer 39

0.1N

Question 40

TWENTIETH NORMAL

Answer 40

0.05N

Question 41

HUNDREDTH NORMAL

Answer 41

0.01N

Question 42

THOUSANDTH NORMAL

Answer 42

0.001N

Question 43

refers to the no. of moles of solute per liter of solution

Answer 43

MOLARITY

Question 44

refers to the no. of moles of solute per kilogram of solvent

Answer 44

MOLALITY

Question 45

a solution of known concentration or a solution whose exact concentration is known

Answer 45

STANDARD SOLUTION

Question 46

Standard acid solution

Answer 46

HCl, H 2SO 4, HClO

Question 47

Standard alkali solution

Answer 47

NaOH, KOH, CH 3ONa

Question 48

Process of determining exact concentration of a solution.

Answer 48

STANDARDIZATION

Question 49

Types of volumetric solution:

Answer 49

1. Primary Standard 2. Secondary Standard

Question 50

chemically pure solid substance almost 99.9% pure used in the standardization of a solution

Answer 50

Primary Standard

Question 51

Other requirements for primary standard are:

Answer 51

1. It must be easy to prepare and pure. 2. It must be of definite known composition. 3. It must be stable. 4. It must react stoichiometrically with the substance present in the solution. 5. It must be soluble in water. 6. it must have a fairly high equivalent weight.

Question 52

Primary Standard for acid solutions:

Answer 52

Anhydrous Na2 CO 3 CaCO 3 THAM

Question 53

Primary Standard for alkali solutions:

Answer 53

Benzoic acid Potassium biphthalate Sulfamic acid

Question 54

substance that is not necessarily pure but whose exact purity is known.

Answer 54

Secondary Standard

Question 55

A standard solution is a commonly used

Answer 55

secondary standard

Question 56

to standardize only one of the solutions by using a primary standard and the other is standardized by using a secondary standard

Answer 56

Common practice

Question 57

Titrate with HCl until a _________ is achieved even after boiling the solution.

Answer 57

permanent faint pink color