What are the factors affecting on nature of deposit in electrogravimetry?
Factors Affecting the Deposition Current density. Temperature. The presence of complexing agents. Chemical nature of ion.
Why is electrogravimetry important?
Electrogravimetry has been useful in polymer studies, copper electrodeposition, gold oxidation in an acidic medium, and passivity of iron in a sulfuric medium, as well as Ionic insertion in WO3.
What is electrogravimetry analysis?
Electrogravimetry is a method in which a metal is quantitatively electroplated on to an electrode, usually platinum. The amount of metal plated is determined by the difference in the weight of the electrode before and after electroplating.
What are the possible sources of errors in an electrolysis experiment?
Main errors are fluctuations in the current and inaccurate measurements. When electrolysis is done on a commercial scale it is important to know how much current is required and for how long. This experiment relates the amount of metal removed from an electrode to the electric current and the time the current flows.
Which factors affect the quality of electro deposition process?
Factors Affecting the Quality of Electrodeposition
- Nature of Electrolyte. The nature of electrolyte used in the electrodeposition process greatly affects the formation of smooth deposit.
- Current Density.
- Conductivity.
- Temperature of Solution.
- Electrolytic Concentration.
- Polarization.
- Addition of Agents.
- Throwing Power.
What is controlled potential electrogravimetry?
In constant-potential electrogravimetry the potential at the working electrode is controlled so that only a single electrochemical reaction can occur. The applied potential corresponds to the potential on the plateau of a voltammetric wave of the assayed material.
What are some potential sources of error in the experiment that is described in the article?
Common sources of error include instrumental, environmental, procedural, and human. All of these errors can be either random or systematic depending on how they affect the results.
What is voltammetry method?
Voltammetry refers to electrochemical methods in which a specific voltage profile is applied to a working electrode as a function of time and the current produced by the system is measured.
What is coulometry analysis?
Coulometry is the quantitative determination of any substance that can be made to undergo an electrochemical reaction with 100% current efficiency, i.e. the number of Coulombs required to carry out a chemical reaction is measured (integration is needed).
What is electrogravimetry and how is it used?
The use… Electrogravimetry was briefly described above as an interference removal technique. This method employs two or three electrodes, just as in voltammetry. Either a constant current or a constant potential is applied to the preweighed working electrode. The working electrode corresponds to the indicator electrode…
What is the working electrode in voltammetry?
The working electrode corresponds to the indicator electrode in voltammetry and most other electroanalytical methods. A solid product of the electrochemical reaction of the analyte coats the electrode during application of the electric current or potential.
What happens to the working electrode during electrochemical analysis?
A solid product of the electrochemical reaction of the analyte coats the electrode during application of the electric current or potential. After the assayed substance has been completely removed from the solution by the electrochemical reaction, the working electrode is removed, rinsed, dried, and weighed.
What happens during amperometric electrogravimetry?
During amperometric assays the potential of the indicator electrode is adjusted to a value on the plateau of the voltammetric wave, as during controlled-potential electrogravimetry and coulometry (see above).