Volumetric Method

Question 1

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

Answer 1

Volumetric Method

Question 2

Acid and base combine to form SALT and WATER

Answer 2

NEUTRALIZATION

Question 3

The 3 principle involved in volumetric method neutralization

Answer 3

Precipitation, Complexation, REDOX

Question 4

the chemical substance being analyzed or the
active constituentin the sample.

Answer 4

Analyte /titrand

Question 5

one which concentration is accurately known.- written using 4 decimal places

Answer 5

Standard solution(titrant or Volumetric Solution)

Question 6

process by which a standard solution is brought
into reaction until the desired reaction is
accomplished

Answer 6

Titration

Question 7

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

Answer 7

Indicator/ Test solution

Question 8

Reagents in such
solvents and of such
definite concentrations
that it will suitable for
specified purpose

Answer 8

Test solution (indicator)

Question 9

Usual concentration is _______,
with _______ of indicator
used for ____ of the analyte.

Answer 9

0.05% (1)
0.1 to 0.2 ml (2)
10 ml (3)

Question 10

shown by the change of color of the indicator. can be seen by a naked eye

Answer 10

Endpoint / practical

Question 11

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

Answer 11

Equivalence point/ stoichiometric point /theoretical endpoint

Question 12

(ph range) 0 –2.0
(Acid ) Yellow
(Base) Green

Answer 12

Malachite Green

Question 13

(ph range) 3.2 -4.4
(Acid ) Pink
(Base) Yellow

Answer 13

Methyl orange

Question 14

(ph range) 4.2 –6.2
(Acid ) Red
(Base) Yellow

Answer 14

Methyl Red

Question 15

(ph range) 6.0 –7.6
(Acid ) Yellow
(Base) Blue

Answer 15

Bromothymol blue

Question 16

(ph range) 8 -10
(Acid ) Colorless
(Base) Pink or red

Answer 16

Phenolphthalein

Question 17

(ph range) 8 –9.2
(Acid ) yellow
(Base) blue

Answer 17

Thymol blue

Question 18

_________follow the color of acids

Answer 18

Methyl Red and methyl orange

Question 19

_________ follow the color of bases

Answer 19

Malachite green, bromothymol blue and thymol blue

Question 20

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

Answer 20

phenolphthalein

Question 21

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

Answer 21

methyl red

Question 22

When a strong acidis titrated with a strong alkali, ???

Answer 22

methyl red, methyl orange or Pp may be used

Question 23

____ should never be titrated with _____ indicator will not give a sharp endpoint

Answer 23

Weak alkali (1)
weak acid (2)

Question 24

Precipitation indicator

Answer 24

common: silver nitrate (AgNO3)
*Dichlorofluorescein
*Eosin Y
*Potassium chromate
*FAS (Ferrous Ammonium Sulfate)

Question 25

Complexometry indicator

Answer 25

common: EDTA/ Ethylene diamine tetraacetic acid * Dithiazone *Eriochrome black *Hydroxynaphthol blue

Question 26

REDOX indicator

Answer 26

*Iodine TS *Potassium permanganate VS *Starch TS

Question 27

number of moles of reactive unit in a compound that which reacts or takes the place of one mole of Hydrogen ion ACIDS/Bases -# of H or OH Salts –Valence of cation

Answer 27

Equivalent

Question 28

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

Answer 28

Equivalent weight

Question 29

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 29

TITER

Question 30

contains one gram equivalent weight of solute in a liter of solution or one gram milliequivalent weight in a milliliter of solution.

Answer 30

Normality/ Normal solution

Question 31

contains a mole (one gram molecular weight) in a liter of solution or one millimole per milliliter of solution. A moleis the molecular weight expressed in grams. A millimoleis one thousandth part of a mole.

Answer 31

Molarity

Question 32

a section of chemistry that involves using relationships between reactants and/or products in a chemical reaction to determine desired quantitative data.

Answer 32

Stoichiometry

Question 33

Knowing EXACTLY what the concentration of the solution Process of determining exact concentration of a solution.

Answer 33

Standardization

Question 34

2 Types of Volumetric solutions:

Answer 34

Primary standard Secondary standard

Question 35

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

Answer 35

Primary Standard

Question 36

Primary Standard for acid solutions?

Answer 36

Anhydrous pure sodium carbonate Calcium carbonate THAM (trihydroxymethylaminomethane)

Question 37

Primary Standard for alkali solutions

Answer 37

benzoic acid, potassium biphthalate sulfamic

Question 38

Substance that is not necessarily pure but whose exact purity is known. *A standard solution is a commonly used ______

Answer 38

Secondary Standard

Question 39

acid burette is also known as? provide three-way stopcocks for easier fill

Answer 39

Geissler burette

Question 40

burettes do not have stopcocks at their tips and use to hold a base titrant

Answer 40

Mohr burette

Question 41

part of volumetric analysis whereby an acid solution at known concentration, along with a specific indicator, is used to titrate a base solution and thus work out its concentration“. titrant: acid analyte: Base

Answer 41

Acidimetry

Question 42

part of volumetric chemical analysis which enables us to work out the concentration of an acid solution using an alkaline solution at a known concentration and a suitable indicator. titrant: Base analyte: Acid

Answer 42

alkalimetry