Conductometry is a measurement of electrolytic conductivity to monitor a progress of chemical These finding culminated into potentiometric titrations and the first instrument for volumetric analysis by Robert Behrend in while titrating. Conductometry deals with the conductivity of electro- lytes. The resistance of the A conductometer is an instrument for measuring complex resistances using. Answer to WHAT IS THE BASIC INSTRUMENTATION OF CONDUCTOMETRY?.

Author: Guzuru Faudal
Country: Senegal
Language: English (Spanish)
Genre: Technology
Published (Last): 9 March 2005
Pages: 160
PDF File Size: 18.43 Mb
ePub File Size: 12.24 Mb
ISBN: 806-5-89355-459-1
Downloads: 61458
Price: Free* [*Free Regsitration Required]
Uploader: Sazahn

Marked increases or decrease in conductance are associated with the changing concentrations of the two most highly conducting ions—the hydrogen and hydroxyl ions.

The number of ions present in the solution is directly proportional to the conductance. This is done mainly by the replacement of the hydrogen ion with other cation. That is mainly of the number of ions present in the solution.

Weak acid with weak base: This is mainly based instrimentation the dissociation of the compounds into ions. Number ions present in the sample solution: What is the principle involved in the conductometry?

In this method, the conductance of the hydrogen ions and hydroxyl ions are compared with the conductivity of the sample solution. Lowitz first prepared the moisture-free solvents non-aqueous solvents.

By using this site, you agree to the Terms of Use and Privacy Policy. This method is first used in the determination of dyes. Then these electrodes are repeatedly washed with the distilled water and finally with the conductivity water.

These are commonly employed by dipping in the analyte solution. After the equivalence point is achieved the conductivity increases rapidly due to the excess OH- ions. The resistance is expressed by the following equation: This method condkctometry mainly used for the determination of the physico-chemical properties of the compounds.


The electrodes are made up of platinum sheets. The value is 0. Used in the determination of the ionic product of the water. Conductometry was further improved with the development of the glass electrode, which began in No need for the specific conductivity. The titration of the ferrous ions with the dichromate ions. In this type, large electrodes are placed with small distance.

Then conductivity increases slightly up to the equivalence point volume, due to contribution of the salt cation and anion. Conductive measurements began as early as the 18th century, when Andreas Baumgartner noticed that salt and mineral waters from Bad Gastein in Austria conducted electricity. Cnoductometry is the formation of the metal ion and the second one is the formation of the complex.


The weak acid such as acetic acid is titrated with the strong base such as sodium hydroxide. Used in the determination of the salinity of the sea water.

Appropriate for the dilute solutions. Conductometry is a measurement of electrolytic conductivity to monitor ijstrumentation progress of chemical reaction. January Learn how and when to remove this template message. Then plot the graph between the conductivity and the volume of the titrant which shows the plateau. The conductometric apparatus is composed of the following.

Conductometry – Wikipedia

For example, titrations of the strong acid such as HCL with the weak base such as the ammonium hydroxide. Unknown 17 November at Explain the concept of cell constant. Fritz first used this method to distinguish the aromatic and aliphatic amines by using the perchloric acid as titrant. Weak acid with a strong base: Initially the addition of condkctometry silver nitrate to the potassium chloride instru,entation the stability in the conductivity and the excess of the silver nitrate addition increases the conductivity because of the formation of the single precipitate.


These electrodes are fixed in a constant distance and are sealed in the connected tubes.

Hence diluted solutions are used for the conductivity measurements. In Folin and Flanders titrated the acidic substances by using the non-aqueous instrumenyation such as benzene, chloroform and chloroform-methanol mixture. Then the plot between the conductivity and the volume of the titrant shows the plateau. The precipitate formation is taken as the end point when the conductivity is measured.

These are carried out as same as the acid—base titrations by using non-aqueous solvents. The plot between the conductivity and the volume of the titrant shows the V-shaped curve.

Strong acid with weak base: It consists of a meter bridge wire AB with a fixed resistance R on both the ends.

The movement of the ions is conductometgy depended on the concentration of the ions. These conductivity cells are made up of glass. They are made up of glass fitted with the platinum electrodes. Labels Conductometry free pharmacy study material pharmaceutical analysis pharmaceutical analysis lecture notes.

All these are operated by the battery.