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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/13504
Ver los metadatos del registro completo
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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 Técnicas2025-09-29T10:23:33Zoai: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:34982025-09-29 10:23:33.647CONICET 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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1844614230617096192 |
score |
13.070432 |