Cargando…

Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell

[Image: see text] Feasibility of performing multiple coulometric titrations in a single course of electrolysis is presented. In these titrations, three pairs of cathode and anode compartments were connected with a network of electrodes and salt bridges. Passage of current through the cell caused con...

Descripción completa

Detalles Bibliográficos
Autores principales: Harris, Shaquithea, Gonzales, Jaimie, Melaku, Samuel, Dabke, Rajeev B.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6648549/
https://www.ncbi.nlm.nih.gov/pubmed/31459581
http://dx.doi.org/10.1021/acsomega.8b03141
_version_ 1783437894731431936
author Harris, Shaquithea
Gonzales, Jaimie
Melaku, Samuel
Dabke, Rajeev B.
author_facet Harris, Shaquithea
Gonzales, Jaimie
Melaku, Samuel
Dabke, Rajeev B.
author_sort Harris, Shaquithea
collection PubMed
description [Image: see text] Feasibility of performing multiple coulometric titrations in a single course of electrolysis is presented. In these titrations, three pairs of cathode and anode compartments were connected with a network of electrodes and salt bridges. Passage of current through the cell caused concurrent electrolysis in cathode and anode compartments. Electrogenerated reagents produced in these compartments were used as titrants for quantifying the analyte samples. Endpoints of the titrations were determined from the visual color change of an indicator. The charge passing through the cell was monitored and Faraday’s laws of electrolysis were applied to assess the quantitative relation between the charge and analyte concentration. Experimentally determined coulombs required to titrate aqueous potassium hydrogen phthalate, MnO(4)(–), OH(–), and S(2)O(3)(2–) were 0.100, 0.466, 0.103, and 0.0934 C, respectively. These results matched with estimated values of 0.0965, 0.482, 0.0965, and 0.0965 C, respectively. Agreement between the coulombs determined from experimental results and reaction stoichiometry suggests a feasible application of concurrent coulometric titrations. Efficacy of the method was tested for determining the active ingredients in household vinegar and vitamin C dietary supplement tablets. Quantities of acetic acid and ascorbic acid in these products were 5.1% and 980 mg, respectively, agreeing with the quantities determined from volumetric titrations (5.1% and 990 mg) and manufacturer’s label (5.0% and 1000 mg).
format Online
Article
Text
id pubmed-6648549
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher American Chemical Society
record_format MEDLINE/PubMed
spelling pubmed-66485492019-08-27 Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell Harris, Shaquithea Gonzales, Jaimie Melaku, Samuel Dabke, Rajeev B. ACS Omega [Image: see text] Feasibility of performing multiple coulometric titrations in a single course of electrolysis is presented. In these titrations, three pairs of cathode and anode compartments were connected with a network of electrodes and salt bridges. Passage of current through the cell caused concurrent electrolysis in cathode and anode compartments. Electrogenerated reagents produced in these compartments were used as titrants for quantifying the analyte samples. Endpoints of the titrations were determined from the visual color change of an indicator. The charge passing through the cell was monitored and Faraday’s laws of electrolysis were applied to assess the quantitative relation between the charge and analyte concentration. Experimentally determined coulombs required to titrate aqueous potassium hydrogen phthalate, MnO(4)(–), OH(–), and S(2)O(3)(2–) were 0.100, 0.466, 0.103, and 0.0934 C, respectively. These results matched with estimated values of 0.0965, 0.482, 0.0965, and 0.0965 C, respectively. Agreement between the coulombs determined from experimental results and reaction stoichiometry suggests a feasible application of concurrent coulometric titrations. Efficacy of the method was tested for determining the active ingredients in household vinegar and vitamin C dietary supplement tablets. Quantities of acetic acid and ascorbic acid in these products were 5.1% and 980 mg, respectively, agreeing with the quantities determined from volumetric titrations (5.1% and 990 mg) and manufacturer’s label (5.0% and 1000 mg). American Chemical Society 2019-02-19 /pmc/articles/PMC6648549/ /pubmed/31459581 http://dx.doi.org/10.1021/acsomega.8b03141 Text en Copyright © 2019 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Harris, Shaquithea
Gonzales, Jaimie
Melaku, Samuel
Dabke, Rajeev B.
Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell
title Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell
title_full Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell
title_fullStr Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell
title_full_unstemmed Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell
title_short Feasibility of Performing Concurrent Coulometric Titrations Using a Multicompartment Electrolysis Cell
title_sort feasibility of performing concurrent coulometric titrations using a multicompartment electrolysis cell
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6648549/
https://www.ncbi.nlm.nih.gov/pubmed/31459581
http://dx.doi.org/10.1021/acsomega.8b03141
work_keys_str_mv AT harrisshaquithea feasibilityofperformingconcurrentcoulometrictitrationsusingamulticompartmentelectrolysiscell
AT gonzalesjaimie feasibilityofperformingconcurrentcoulometrictitrationsusingamulticompartmentelectrolysiscell
AT melakusamuel feasibilityofperformingconcurrentcoulometrictitrationsusingamulticompartmentelectrolysiscell
AT dabkerajeevb feasibilityofperformingconcurrentcoulometrictitrationsusingamulticompartmentelectrolysiscell