Available Chlorine in household bleaches by using a new and easy spectrophotometric method

Autores
Caucino, Florencia; Calderón, Ruth; Montes Spinsanti, Gimena; Ciolino, Andrés Eduardo
Año de publicación
2014
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In this communication, an alternative method to determine the "available chlorine" in household bleach, based on the reaction of a known quantity of bleach with a standardized CuSO4.5H2O aqueous solution is proposed. The alkaline media of the bleach can promote the formation of both hydroxyl cupric sulfate and cupric hydroxide, which form a solid mixture that can be separated by filtration. Since the [Cu(H2O)6]2+(aq) complex has a maximum of absorbance at 815 nm, the remaining [Cu(H2O)6]2+(aq) complex in solution after the addition of thebleach can be obtained by spectrophotometric analysis. By using these measurements and the stoichiometry of the process, the "available chlorine" concentration in the household bleach can be easily estimated, in a fast and reliable fashion. The values obtained for different samples of commercial household bleaches by using this methodology were compared with those obtained with the standard sodium thiosulfate titration method. The differences between the values obtained, considering the titration method as the true value, were less than 2 %. Consequently, the spectrophotometric method presented in this communication offers the possibility of comparing the results with other well-established methods, and combines elegantly stoichiometry calculations and spectrophotometry measurements in one laboratory activity.
Fil: Caucino, Florencia . Universidad Nacional del Sur. Departamento de Ingenieria Quimica; Argentina
Fil: Calderón, Ruth . Universidad Nacional del Sur. Departamento de Ingenieria Quimica; Argentina
Fil: Montes Spinsanti, Gimena . Universidad Nacional del Sur. Departamento de Ingenieria Quimica; Argentina
Fil: Ciolino, Andrés Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Planta Piloto de Ingeniería Química (i); Argentina. Universidad Nacional del Sur. Departamento de Ingenieria Quimica; Argentina
Materia
Laboratories And Demonstrations
General Chemistry
Household Bleaches
Available Chlorine
Absorbance
Lambert-Beer Law
Spectrophotometric Method
Analytical Chemistry
Undergraduated Laboratory
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/13504
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/13504
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Available Chlorine in household bleaches by using a new and easy spectrophotometric methodCaucino, Florencia Calderón, Ruth Montes Spinsanti, Gimena Ciolino, Andrés EduardoLaboratories And DemonstrationsGeneral ChemistryHousehold BleachesAvailable ChlorineAbsorbanceLambert-Beer LawSpectrophotometric MethodAnalytical ChemistryUndergraduated Laboratoryhttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1In this communication, an alternative method to determine the "available chlorine" in household bleach, based on the reaction of a known quantity of bleach with a standardized CuSO4.5H2O aqueous solution is proposed. The alkaline media of the bleach can promote the formation of both hydroxyl cupric sulfate and cupric hydroxide, which form a solid mixture that can be separated by filtration. Since the [Cu(H2O)6]2+(aq) complex has a maximum of absorbance at 815 nm, the remaining [Cu(H2O)6]2+(aq) complex in solution after the addition of thebleach can be obtained by spectrophotometric analysis. By using these measurements and the stoichiometry of the process, the "available chlorine" concentration in the household bleach can be easily estimated, in a fast and reliable fashion. The values obtained for different samples of commercial household bleaches by using this methodology were compared with those obtained with the standard sodium thiosulfate titration method. The differences between the values obtained, considering the titration method as the true value, were less than 2 %. Consequently, the spectrophotometric method presented in this communication offers the possibility of comparing the results with other well-established methods, and combines elegantly stoichiometry calculations and spectrophotometry measurements in one laboratory activity.Fil: Caucino, Florencia . Universidad Nacional del Sur. Departamento de Ingenieria Quimica; ArgentinaFil: Calderón, Ruth . Universidad Nacional del Sur. Departamento de Ingenieria Quimica; ArgentinaFil: Montes Spinsanti, Gimena . Universidad Nacional del Sur. Departamento de Ingenieria Quimica; ArgentinaFil: Ciolino, Andrés Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Planta Piloto de Ingeniería Química (i); Argentina. Universidad Nacional del Sur. Departamento de Ingenieria Quimica; ArgentinaThe Chemical Educator2014-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/13504Caucino, Florencia ; Calderón, Ruth ; Montes Spinsanti, Gimena ; Ciolino, Andrés Eduardo; Available Chlorine in household bleaches by using a new and easy spectrophotometric method; The Chemical Educator; The Chemical Educator; 19; 11-2014; 236-2401430-4171enginfo:eu-repo/semantics/altIdentifier/url/http://chemeducator.org/bibs/0019001/19140236.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-15T15:20:43Zoai:ri.conicet.gov.ar:11336/13504instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-10-15 15:20:44.186CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Available Chlorine in household bleaches by using a new and easy spectrophotometric method
title Available Chlorine in household bleaches by using a new and easy spectrophotometric method
spellingShingle Available Chlorine in household bleaches by using a new and easy spectrophotometric method
Caucino, Florencia
Laboratories And Demonstrations
General Chemistry
Household Bleaches
Available Chlorine
Absorbance
Lambert-Beer Law
Spectrophotometric Method
Analytical Chemistry
Undergraduated Laboratory
title_short Available Chlorine in household bleaches by using a new and easy spectrophotometric method
title_full Available Chlorine in household bleaches by using a new and easy spectrophotometric method
title_fullStr Available Chlorine in household bleaches by using a new and easy spectrophotometric method
title_full_unstemmed Available Chlorine in household bleaches by using a new and easy spectrophotometric method
title_sort Available Chlorine in household bleaches by using a new and easy spectrophotometric method
dc.creator.none.fl_str_mv Caucino, Florencia
Calderón, Ruth
Montes Spinsanti, Gimena
Ciolino, Andrés Eduardo
author Caucino, Florencia
author_facet Caucino, Florencia
Calderón, Ruth
Montes Spinsanti, Gimena
Ciolino, Andrés Eduardo
author_role author
author2 Calderón, Ruth
Montes Spinsanti, Gimena
Ciolino, Andrés Eduardo
author2_role author
author
author
dc.subject.none.fl_str_mv Laboratories And Demonstrations
General Chemistry
Household Bleaches
Available Chlorine
Absorbance
Lambert-Beer Law
Spectrophotometric Method
Analytical Chemistry
Undergraduated Laboratory
topic Laboratories And Demonstrations
General Chemistry
Household Bleaches
Available Chlorine
Absorbance
Lambert-Beer Law
Spectrophotometric Method
Analytical Chemistry
Undergraduated Laboratory
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.4
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In this communication, an alternative method to determine the "available chlorine" in household bleach, based on the reaction of a known quantity of bleach with a standardized CuSO4.5H2O aqueous solution is proposed. The alkaline media of the bleach can promote the formation of both hydroxyl cupric sulfate and cupric hydroxide, which form a solid mixture that can be separated by filtration. Since the [Cu(H2O)6]2+(aq) complex has a maximum of absorbance at 815 nm, the remaining [Cu(H2O)6]2+(aq) complex in solution after the addition of thebleach can be obtained by spectrophotometric analysis. By using these measurements and the stoichiometry of the process, the "available chlorine" concentration in the household bleach can be easily estimated, in a fast and reliable fashion. The values obtained for different samples of commercial household bleaches by using this methodology were compared with those obtained with the standard sodium thiosulfate titration method. The differences between the values obtained, considering the titration method as the true value, were less than 2 %. Consequently, the spectrophotometric method presented in this communication offers the possibility of comparing the results with other well-established methods, and combines elegantly stoichiometry calculations and spectrophotometry measurements in one laboratory activity.
Fil: Caucino, Florencia . Universidad Nacional del Sur. Departamento de Ingenieria Quimica; Argentina
Fil: Calderón, Ruth . Universidad Nacional del Sur. Departamento de Ingenieria Quimica; Argentina
Fil: Montes Spinsanti, Gimena . Universidad Nacional del Sur. Departamento de Ingenieria Quimica; Argentina
Fil: Ciolino, Andrés Eduardo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Planta Piloto de Ingeniería Química (i); Argentina. Universidad Nacional del Sur. Departamento de Ingenieria Quimica; Argentina
description In this communication, an alternative method to determine the "available chlorine" in household bleach, based on the reaction of a known quantity of bleach with a standardized CuSO4.5H2O aqueous solution is proposed. The alkaline media of the bleach can promote the formation of both hydroxyl cupric sulfate and cupric hydroxide, which form a solid mixture that can be separated by filtration. Since the [Cu(H2O)6]2+(aq) complex has a maximum of absorbance at 815 nm, the remaining [Cu(H2O)6]2+(aq) complex in solution after the addition of thebleach can be obtained by spectrophotometric analysis. By using these measurements and the stoichiometry of the process, the "available chlorine" concentration in the household bleach can be easily estimated, in a fast and reliable fashion. The values obtained for different samples of commercial household bleaches by using this methodology were compared with those obtained with the standard sodium thiosulfate titration method. The differences between the values obtained, considering the titration method as the true value, were less than 2 %. Consequently, the spectrophotometric method presented in this communication offers the possibility of comparing the results with other well-established methods, and combines elegantly stoichiometry calculations and spectrophotometry measurements in one laboratory activity.
publishDate 2014
dc.date.none.fl_str_mv 2014-11
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/13504
Caucino, Florencia ; Calderón, Ruth ; Montes Spinsanti, Gimena ; Ciolino, Andrés Eduardo; Available Chlorine in household bleaches by using a new and easy spectrophotometric method; The Chemical Educator; The Chemical Educator; 19; 11-2014; 236-240
1430-4171
url http://hdl.handle.net/11336/13504
identifier_str_mv Caucino, Florencia ; Calderón, Ruth ; Montes Spinsanti, Gimena ; Ciolino, Andrés Eduardo; Available Chlorine in household bleaches by using a new and easy spectrophotometric method; The Chemical Educator; The Chemical Educator; 19; 11-2014; 236-240
1430-4171
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://chemeducator.org/bibs/0019001/19140236.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv The Chemical Educator
publisher.none.fl_str_mv The Chemical Educator
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.22299

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