Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.

To test the completeness of the deposition, the fresh electrode surface is exposed to the solution while continuing the electrolysis and checking for new deposits. The absence of new deposits signifies the completion of the reaction. Other tests include checking for color disappearance or conducting a qualitative test for the analyte in the solution.

Underpotential deposition, or monolayer formation on the electrode surface, occurs at a potential below the Nernst equilibrium potential. Conversely, overpotential (a potential above the Nernst potential) is required for bulk metal film deposition. Overpotential factors can cause unwanted reactions and affect the accuracy of the analysis.

Depolarizers can be added to prevent undesired side reactions by scavenging excess electrons into non-interfering reactions and controlling the working electrode's potential.

Dal capitolo 10:

article

Now Playing

10.12 : Electrogravimetric Analysis: Overview

Electrochemical Analyses and Redox Titration

88 Visualizzazioni

article

10.1 : Elettrochimica: Panoramica

Electrochemical Analyses and Redox Titration

309 Visualizzazioni

article

10.2 : Elettrodi: Panoramica

Electrochemical Analyses and Redox Titration

197 Visualizzazioni

article

10.3 : Metodi elettrochimici interfacciali: panoramica

Electrochemical Analyses and Redox Titration

128 Visualizzazioni

article

10.4 : Potenziometria: Panoramica

Electrochemical Analyses and Redox Titration

212 Visualizzazioni

article

10.5 : Potenziometria: Tipi di elettrodi

Electrochemical Analyses and Redox Titration

241 Visualizzazioni

article

10.6 : Potenziometria: Elettrodi a membrana

Electrochemical Analyses and Redox Titration

187 Visualizzazioni

article

10.7 : Titolazione Redox: Panoramica

Electrochemical Analyses and Redox Titration

133 Visualizzazioni

article

10.8 : Titolazione Redox: iodiometria e iodometria

Electrochemical Analyses and Redox Titration

317 Visualizzazioni

article

10.9 : Titolazione Redox: Altri agenti ossidanti e riducenti

Electrochemical Analyses and Redox Titration

84 Visualizzazioni

article

10.10 : Titolazione potenziometrica: Panoramica

Electrochemical Analyses and Redox Titration

168 Visualizzazioni

article

10.11 : Previsione del punto finale: Gran Plot

Electrochemical Analyses and Redox Titration

84 Visualizzazioni

article

10.13 : Coulometria: Panoramica

Electrochemical Analyses and Redox Titration

86 Visualizzazioni

article

10.14 : Colometria a potenziale controllato: metodi elettrolitici

Electrochemical Analyses and Redox Titration

63 Visualizzazioni

article

10.15 : Colometria a corrente controllata: panoramica

Electrochemical Analyses and Redox Titration

85 Visualizzazioni

See More

JoVE Logo

Riservatezza

Condizioni di utilizzo

Politiche

Ricerca

Didattica

CHI SIAMO

Copyright © 2025 MyJoVE Corporation. Tutti i diritti riservati