O pKa de indicadores ácido-base e os efeitos coloidais

Detalhes bibliográficos
Autor(a) principal: Previdello,Bruno Alarcon Fernandes
Data de Publicação: 2006
Outros Autores: Carvalho,Fernando Rodrigues de, Tessaro,André Luiz, Souza,Vagner Roberto de, Hioka,Noboru
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422006000300032
Resumo: An experiment is proposed that can be included in undergraduate courses of chemistry. The subject is the acidity of organic compounds, which are employed as pH indicators, particularly in acid-base titrations. The indicators used are methyl orange, bromophenol blue and bromocresol green in aqueous medium. The influence of colloidal systems on the equilibrium is evaluated by the pKa. The colloids employed are surfactants like sodium dodecyl sulfate, cetyl-trimethylammonium bromide and a polymeric non-ionic F127 (pluronics). The effect of stabilization promoted by the system on the acidic or basic structureof the indicator establishes the action mechanism of the colloid on the pKa values.
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spelling O pKa de indicadores ácido-base e os efeitos coloidaispKaacid-base indicatorcolloidal systemsAn experiment is proposed that can be included in undergraduate courses of chemistry. The subject is the acidity of organic compounds, which are employed as pH indicators, particularly in acid-base titrations. The indicators used are methyl orange, bromophenol blue and bromocresol green in aqueous medium. The influence of colloidal systems on the equilibrium is evaluated by the pKa. The colloids employed are surfactants like sodium dodecyl sulfate, cetyl-trimethylammonium bromide and a polymeric non-ionic F127 (pluronics). The effect of stabilization promoted by the system on the acidic or basic structureof the indicator establishes the action mechanism of the colloid on the pKa values.Sociedade Brasileira de Química2006-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422006000300032Química Nova v.29 n.3 2006reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422006000300032info:eu-repo/semantics/openAccessPrevidello,Bruno Alarcon FernandesCarvalho,Fernando Rodrigues deTessaro,André LuizSouza,Vagner Roberto deHioka,Noborupor2006-05-25T00:00:00Zoai:scielo:S0100-40422006000300032Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2006-05-25T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv O pKa de indicadores ácido-base e os efeitos coloidais
title O pKa de indicadores ácido-base e os efeitos coloidais
spellingShingle O pKa de indicadores ácido-base e os efeitos coloidais
Previdello,Bruno Alarcon Fernandes
pKa
acid-base indicator
colloidal systems
title_short O pKa de indicadores ácido-base e os efeitos coloidais
title_full O pKa de indicadores ácido-base e os efeitos coloidais
title_fullStr O pKa de indicadores ácido-base e os efeitos coloidais
title_full_unstemmed O pKa de indicadores ácido-base e os efeitos coloidais
title_sort O pKa de indicadores ácido-base e os efeitos coloidais
author Previdello,Bruno Alarcon Fernandes
author_facet Previdello,Bruno Alarcon Fernandes
Carvalho,Fernando Rodrigues de
Tessaro,André Luiz
Souza,Vagner Roberto de
Hioka,Noboru
author_role author
author2 Carvalho,Fernando Rodrigues de
Tessaro,André Luiz
Souza,Vagner Roberto de
Hioka,Noboru
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Previdello,Bruno Alarcon Fernandes
Carvalho,Fernando Rodrigues de
Tessaro,André Luiz
Souza,Vagner Roberto de
Hioka,Noboru
dc.subject.por.fl_str_mv pKa
acid-base indicator
colloidal systems
topic pKa
acid-base indicator
colloidal systems
description An experiment is proposed that can be included in undergraduate courses of chemistry. The subject is the acidity of organic compounds, which are employed as pH indicators, particularly in acid-base titrations. The indicators used are methyl orange, bromophenol blue and bromocresol green in aqueous medium. The influence of colloidal systems on the equilibrium is evaluated by the pKa. The colloids employed are surfactants like sodium dodecyl sulfate, cetyl-trimethylammonium bromide and a polymeric non-ionic F127 (pluronics). The effect of stabilization promoted by the system on the acidic or basic structureof the indicator establishes the action mechanism of the colloid on the pKa values.
publishDate 2006
dc.date.none.fl_str_mv 2006-06-01
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=S0100-40422006000300032
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422006000300032
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40422006000300032
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.29 n.3 2006
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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