Electrogravimetry and Coulometry. Potentiometric measurements are made in the absence of current flow. The measured potential is that of a galvanic or voltaic . 22A The effect of current on cell potential When there is a net current in an electrochemical cell, the measured potential across the two electrodes is no longer. PDF | On Mar 3, , Subhrangsu Dey and others published Electrogravimetry and Coulometry.

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Ag AgCl sCl- 0. In the limiting current region, the electrode is said to be completely polarized since its potential can be changed widely without affecting the current. Feedback Privacy Policy Feedback. Electroanalytical methods Analytical chemistry stubs.


To make this website work, we log user data and share it with processors. The cathode is maintained at V versus SCE throughout the experiment. It is known that in the phenomenon of polarization the coulometty of electrolysis exerts a back EMFwhich reduces the actual EMF of the cell.

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The applied voltage which is just sufficient to overcome the back EMF due to polarization and also to bring about the electrolysis of an electrolyte without any hindrance is known as decomposition potential. Amperostat Auxiliary electrode Dropping mercury electrode Electrode Electrolytic cell Galvanic cell Hanging mercury drop electrode Ion selective electrode Mercury coulometer pH meter Potentiostat Reference electrode Rotating disk electrode Rotating ring-disk electrode Salt bridge Saturated calomel electrode Silver chloride electrode Standard hydrogen electrode Ultramicroelectrode Voltameter Working electrode.


Registration Forgot your password? The oxidation number of Zn has. Adsorptive stripping electrogravimetrry Amperometric titration Anodic stripping voltammetry Bulk electrolysis Cathodic stripping voltammetry Chronoamperometry Coulometry Cyclic voltammetry Differential pulse voltammetry Electrogravimetry Hydrodynamic technique Linear sweep voltammetry Normal pulse voltammetry Polarography Potentiometry Rotated electrode voltammetry Squarewave voltammetry Staircase voltammetry Voltammetry.

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Electrogravimetry and Coulometry | SUBHRANGSU DEY –

Electrode reaction as a series of multiple consecutive steps 2. If a source of potential is applied, electrograavimetry appreciable current will flow through the system, until some minimum potential is applied after which the current will increase as the applied potential increases.

Retrieved from ” https: Electrogravimetry and Coulometry”— Presentation transcript: Articles lacking sources from December All articles lacking sources All stub articles. We think you have liked this presentation.

Concentration polarization occurs because of the finite rate of mass transfer from the solution to the electrode surface. The following electrolytic cell for the determination of Cadmium II in HCl solutions can be considered: Auth with social network: In order to generate a current of I amperes in this cell, a potential that is IR volts more negative than the thermodynamic cell potential must be applied.


This page was last edited on 19 Aprilat The process is similar to electroplating. Electrogravimetry and Coulometry Chapter 22 Bulk Electrolysis: Electrode kinetics and mass transport Plan 1.

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This article does not cite any sources. The cathode is weighed before and after the experiment, and weighing by difference is used to calculate the amount of analyte in the original solution. Products are removed from electrode surfaces in the same ways. Views Read Edit View history.

The current a and IR drop b decrease steadily with time. Electrical charge is the basis of the other electrical quantities, current, voltage, and power. The charge required to convert the analyte to its reaction product is then determined by recording and integrating the current-versus-time curve during the electrolysis.