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Volumetric Analysis

Introduction

Volumetric Analysis is the process of determining the strength of unknown solution with the help of standard solution. It is a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte (a substance to be analyzed).

image Enotes Nepal

Terms used in Titration

Titrant

The solution of known concentration used in titration which is generally taken in burette.

Titrand (or titrate)

The solution of unknown concentration used in titration which is generally taken in Titration flask.

Acidimetry

It is the process of determining the strength of an acid solution with the help of standard alkali solution (basic solution) in presence of indictor.

Alkalimetry

It is the process of determining the strength of an alkali solution (basic solution) with the help of standard acid solution in presence of indictor.

Endpoint (or Neutral point)

the point at which reaction completes as indicated by the change in colour of indicator, is called end point. It is the practical point.

Equivalence point

The point at which equivalent amount of titrant is neutralized by titrand. Theoretical end point is known as equivalent point.

Titration error

The difference between end point and equivalence point in titration

Indicator

The chemicals of substance which indicate the completion of reaction by changing its color. Example phenolphthalein, methyl orange, litmus paper, methyl red, etc.

Normality factor

It is the ratio of weight of the solute taken to the weight of the solute to be taken or the ratio of the practical weight to the theoretical weight.238 Enotes Nepal

Redox titration

The process of determining the strength of reducing agent with the help of standard oxidizing agent and vice-versa is known as redox reaction or titration.
Ex:Titration of KMnOâ‚„ solution in acidic medium against standard Oxalic acid solution.241 Enotes Nepal

Precipitation

Precipitation titration is a type of titration which involves the formation of precipitate during the titration technique242 Enotes Nepal

Equivalent Weight

Equivalent weight of a substance is the number of parts by weight of it which combines or displaces directly or indirectly 1.008 parts by weight of hydrogen or 8 parts by weight of oxygen or 35.5 parts by weight of chlorine.
It is unit less but when expressed in gram, it is known as Gram Equivalent weight239 Enotes Nepal240 Enotes Nepal2 x 1.008 parts of Hâ‚‚ is displaced by 24/1.008 parts of Mg

Equivalent Weight of Acid

Equivalent weight of acid is that weight which is obtained by dividing its molecular weight by number of replaceable hydrogen atoms present in 1mole of acid.
224 Enotes Nepal

Equivalent Weight of Base

Equivalent weight of base is that weight which is obtained by dividing its molecular weight by number of replaceable hydrogen atoms present in 1mole of acid.
224 Enotes Nepal

Equivalent Weight of Oxidizing and Reducing agent

For example, the equivalent weight of KMnOâ‚„ is different in different medium.

  • In Acidic medium246 Enotes Nepal
  • In Basic medium247 Enotes Nepal
  • In Neutral medium248 Enotes Nepal
  • Reducing Agent249 Enotes Nepal

Concentration of solution

Percentage

W/W

It is defined as the mass of solute present in 100 gram of its solution. It is called % (W/W) i.e. percent weight by weight

For example, 2% (W/W) solution of NaOH represent 2 g of NaOH dissolved in 100 g of solution

W/V

Percentage concentration is also defined as the mass of solute present in 100 ml of its solution. It is called % (W/V) i.e. percent weight by volume

For example, 2% (W/V) solution of NaOH represent 2 g of NaOH dissolved in 100 ml of solution

V/V

Percentage concentration is also defined as the volume of solute present in 100 ml of its solution. It is called % (V/V) i.e. percent volume by volume

For example, 2% (V/V) solution of NaOH represent 2 g of NaOH dissolved in 100 ml of solution