Analytical Methods-I: Principle of Gravimetric Analysis and Titrimetric

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Principle of Gravimetric Analysis

Based on obtaining precipitated filtrates that are free from pollutants

It is of four types

  • Precipitation Gravimetric Analysis

  • Simple Gravimetric Analysis

  • Volatilization Gravimetry

  • Thermo Gravimetric Analysis

Titrimetric

  • Involves the estimation of volume of known concentration (titrant) of solution that reacted with analyte

  • Principle: At equivalent point, equivalent weight of titrant reacts with titre

Bomb Calorimeter

  • Used to determine heat of combustion.

  • Principle: In a measured volume of heat absorbing medium, the released energy by combustion of sample is absorbed and the temperature rise is noted down.

Paper Chromatography

  • It is a type of partition chromatography where the substances are distributed between two liquids.

  • The stationary liquid - stationary phase

  • The moving liquid - mobile phase or developing solvent

  • The basis of separation is the migration of components of the mixture with different rates.

Thin Layer Chromatography

  • The principle used is adsorption or partition or combination of both.

  • In the stationary phase, components with lower affinity travel downward slowly

  • For adsorbent, components with higher affinity move slowly which causes separation of components.

High Performance Liquid Chromatography

  • The principle of HPLC is separation by adsorption.

  • Mobile phase carries various components which are driven by capillary action. Their affinity towards the adsorbent, decides their adsorption on the stationary phase.

Gas Chromatography

It works on the principle of separation of a volatile compound within a fixed condition of parameters in between a liquid/solid stationary phase and a gaseous mobile

Multiple Choice Questions

1. Titrimetric is also known as

  1. Volumetric analysis

  2. Gravimetric analysis

  3. Qualitative analysis

  4. Quantitative analysis

Answer: a

2. Which of the following is used to determine the heat of combustion?

  1. Heating Mantle

  2. Acid titration

  3. Bomb Calorimeter

  4. Thin Layer Chromatography

Answer: c

3. Which among the following is used for separation of volatile compounds?

  1. Gas chromatography

  2. High performance liquid chromatography

  3. Paper chromatography

  4. All of the above

Answer: a

4. The stationary phase of paper chromatography has

  1. Solid

  2. Stationary liquid

  3. Moving liquid

  4. All of the above

Answer: b

#Analytical Methods-I

#NTA UGC NET

#Titrimetric

#Gravimetry,

#Bomb Calorimetry

#Chromatography

#Paper Chromatography

#TLC

#GC

#HPLC

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