Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting law

Detalhes bibliográficos
Autor(a) principal: Sabadini,Edvaldo
Data de Publicação: 2013
Outros Autores: Carvalho,Larissa Vieira Cavalcanti
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000100031
Resumo: The effects of ionic strength on ions in aqueous solutions are quite relevant, especially for biochemical systems, in which proteins and amino acids are involved. The teaching of this topic and more specifically, the Debye-Hückel limiting law, is central in chemistry undergraduate courses. In this work, we present a description of an experimental procedure based on the color change of aqueous solutions of bromocresol green (BCG), driven by addition of electrolyte. The contribution of charge product (z+|z-|) to the Debye-Hückel limiting law is demonstrated when the effects of NaCl and Na2SO4 on the color of BCG solutions are compared.
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spelling Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting lawcolor changeionic strength effectvisualization of the Debye-Hückel lawThe effects of ionic strength on ions in aqueous solutions are quite relevant, especially for biochemical systems, in which proteins and amino acids are involved. The teaching of this topic and more specifically, the Debye-Hückel limiting law, is central in chemistry undergraduate courses. In this work, we present a description of an experimental procedure based on the color change of aqueous solutions of bromocresol green (BCG), driven by addition of electrolyte. The contribution of charge product (z+|z-|) to the Debye-Hückel limiting law is demonstrated when the effects of NaCl and Na2SO4 on the color of BCG solutions are compared.Sociedade Brasileira de Química2013-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000100031Química Nova v.36 n.1 2013reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422013000100031info:eu-repo/semantics/openAccessSabadini,EdvaldoCarvalho,Larissa Vieira Cavalcantieng2013-02-15T00:00:00Zoai:scielo:S0100-40422013000100031Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2013-02-15T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting law
title Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting law
spellingShingle Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting law
Sabadini,Edvaldo
color change
ionic strength effect
visualization of the Debye-Hückel law
title_short Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting law
title_full Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting law
title_fullStr Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting law
title_full_unstemmed Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting law
title_sort Visual demonstration of the ionic strength effect in the classroom: the Debye-Hückel limiting law
author Sabadini,Edvaldo
author_facet Sabadini,Edvaldo
Carvalho,Larissa Vieira Cavalcanti
author_role author
author2 Carvalho,Larissa Vieira Cavalcanti
author2_role author
dc.contributor.author.fl_str_mv Sabadini,Edvaldo
Carvalho,Larissa Vieira Cavalcanti
dc.subject.por.fl_str_mv color change
ionic strength effect
visualization of the Debye-Hückel law
topic color change
ionic strength effect
visualization of the Debye-Hückel law
description The effects of ionic strength on ions in aqueous solutions are quite relevant, especially for biochemical systems, in which proteins and amino acids are involved. The teaching of this topic and more specifically, the Debye-Hückel limiting law, is central in chemistry undergraduate courses. In this work, we present a description of an experimental procedure based on the color change of aqueous solutions of bromocresol green (BCG), driven by addition of electrolyte. The contribution of charge product (z+|z-|) to the Debye-Hückel limiting law is demonstrated when the effects of NaCl and Na2SO4 on the color of BCG solutions are compared.
publishDate 2013
dc.date.none.fl_str_mv 2013-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000100031
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000100031
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0100-40422013000100031
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv Química Nova v.36 n.1 2013
reponame:Química Nova (Online)
instname:Sociedade Brasileira de Química (SBQ)
instacron:SBQ
instname_str Sociedade Brasileira de Química (SBQ)
instacron_str SBQ
institution SBQ
reponame_str Química Nova (Online)
collection Química Nova (Online)
repository.name.fl_str_mv Química Nova (Online) - Sociedade Brasileira de Química (SBQ)
repository.mail.fl_str_mv quimicanova@sbq.org.br
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