CHAPTER 3- Principles of Titrimetric (Volumetric) Analysis

Question 1

Analytical methods in which the volume of a solution of known concentration consumed during an analysis is taken as a measure of the amount of active constituent in sample analyzed

Answer 1

Titrimetric Methods of Analysis

Question 2

Or the active constituent in the sample

Answer 2

Analyte / Titrand

Question 3

• Solution of known concentration
• Solution added by means of buret

Answer 3

Titrant

Question 4

Chemical which changes color at or near the point in the titration where equivalent quantities of analyte and titrant have reacted

Answer 4

Indicator

Question 5

• Equivalence Point
• Theoretical point at which equivalent amounts of each (analyte & titrant) have reacted

Answer 5

Stoichiometric Point

Question 6

A sudden change in color apparent by the use of
indicators

Answer 6

End Point

Question 7

• Standard Solutions
• Solution of known strength used in titrimetric assay

Answer 7

Volumetric Solution

Question 8

Solution of indicators used for volumetric determinations

Answer 8

Test Solution

Question 9

• Equiv. or Eq.
• number of gram equivalents

Answer 9

Equivalent Weight

Question 10

• mEq
  -Number of gram milliequivalent
• More frequently used
  Eq wt = MW/ f
  mEq wt = MW/ f x 1000

Answer 10

Milliequivalent

Question 11

f = number of replaceable hydrogen
Ex: HCl, H2SO4

Answer 11

Acids

Question 12

f = number of replaceable OH
Ex. NaOH, Mg(OH)2

Answer 12

Base

Question 13

f = total positive or negative charges
Ex: NaCl, MgO

Answer 13

Salts

Question 14

• Determination of the exact concentration of the solution
• Use of another standard solution known as secondary standard or by the use of carefully weighed sample of a substance of known purity which is termed as primary standard

Answer 14

Standardization

Question 15

• Solid substance used for direct standardization of solution

Answer 15

Primary Standard

Question 16

• Solution of known concentration (liquid)

Answer 16

Secondary Standard

Question 17

• High purity - 99.9%
• Definite and known composition
• Not affected by drying
• Soluble in H2O

Answer 17

Requirements for Primary Standard

Question 18

Standardization of NaOH; 4 Primary Standard

Answer 18

1. Potassium Acid Phthalate (C6H4COOK*COOH)
2. Sulfamic Acid
3. Benzoic Acid
4. Potassium Acid Iodate

Question 19

3 Concentrations

Answer 19

1. Normality
2. Molarity
3. Percentage