Determination of the pKa value of phenolphthalein by means of absorbance measurements
- Autores
- Alonso, Manuel; Chapela, Sebastián P.; Cristaldo, María L.; Nievas, Inés; Burgos Oliver Gamondi, Hilda I.; Stella, Carlos Alberto
- Año de publicación
- 2010
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We here report a laboratory protocol for the determination of the pKa value of an acid by means of determinations obtained with a spectrophotometer. Students determine the acidity constant (Ka) and the pKa associated with phenolphthalein from the absorbance values obtained from phenolphthalein solutions at different pHs. The present protocol for the determination of the pKa takes a very short time and is useful when teaching in conditions with limited equipment.
Fil: Alonso, Manuel. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina
Fil: Chapela, Sebastián P.. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina
Fil: Cristaldo, María L.. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina
Fil: Nievas, Inés. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina
Fil: Burgos Oliver Gamondi, Hilda I.. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina
Fil: Stella, Carlos Alberto. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina - Materia
- Medical science teaching
- Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/15288
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Determination of the pKa value of phenolphthalein by means of absorbance measurementsAlonso, ManuelChapela, Sebastián P.Cristaldo, María L.Nievas, InésBurgos Oliver Gamondi, Hilda I.Stella, Carlos AlbertoMedical science teachinghttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1We here report a laboratory protocol for the determination of the pKa value of an acid by means of determinations obtained with a spectrophotometer. Students determine the acidity constant (Ka) and the pKa associated with phenolphthalein from the absorbance values obtained from phenolphthalein solutions at different pHs. The present protocol for the determination of the pKa takes a very short time and is useful when teaching in conditions with limited equipment.Fil: Alonso, Manuel. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; ArgentinaFil: Chapela, Sebastián P.. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; ArgentinaFil: Cristaldo, María L.. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; ArgentinaFil: Nievas, Inés. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; ArgentinaFil: Burgos Oliver Gamondi, Hilda I.. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; ArgentinaFil: Stella, Carlos Alberto. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaScientific Research2010-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/15288Alonso, Manuel; Chapela, Sebastián P.; Cristaldo, María L.; Nievas, Inés; Burgos Oliver Gamondi, Hilda I.; et al.; Determination of the pKa value of phenolphthalein by means of absorbance measurements; Scientific Research; Creative Education; 1; 2; 9-2010; 130-1332151-47552151-4755enginfo:eu-repo/semantics/altIdentifier/doi/10.4236/ce.2010.12020info:eu-repo/semantics/altIdentifier/url/http://www.scirp.org/(S(i43dyn45teexjx455qlt3d2q))/journal/PaperInformation.aspx?PaperID=3018info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:41:15Zoai:ri.conicet.gov.ar:11336/15288instacron: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 10:41:15.638CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Determination of the pKa value of phenolphthalein by means of absorbance measurements |
title |
Determination of the pKa value of phenolphthalein by means of absorbance measurements |
spellingShingle |
Determination of the pKa value of phenolphthalein by means of absorbance measurements Alonso, Manuel Medical science teaching |
title_short |
Determination of the pKa value of phenolphthalein by means of absorbance measurements |
title_full |
Determination of the pKa value of phenolphthalein by means of absorbance measurements |
title_fullStr |
Determination of the pKa value of phenolphthalein by means of absorbance measurements |
title_full_unstemmed |
Determination of the pKa value of phenolphthalein by means of absorbance measurements |
title_sort |
Determination of the pKa value of phenolphthalein by means of absorbance measurements |
dc.creator.none.fl_str_mv |
Alonso, Manuel Chapela, Sebastián P. Cristaldo, María L. Nievas, Inés Burgos Oliver Gamondi, Hilda I. Stella, Carlos Alberto |
author |
Alonso, Manuel |
author_facet |
Alonso, Manuel Chapela, Sebastián P. Cristaldo, María L. Nievas, Inés Burgos Oliver Gamondi, Hilda I. Stella, Carlos Alberto |
author_role |
author |
author2 |
Chapela, Sebastián P. Cristaldo, María L. Nievas, Inés Burgos Oliver Gamondi, Hilda I. Stella, Carlos Alberto |
author2_role |
author author author author author |
dc.subject.none.fl_str_mv |
Medical science teaching |
topic |
Medical science teaching |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
We here report a laboratory protocol for the determination of the pKa value of an acid by means of determinations obtained with a spectrophotometer. Students determine the acidity constant (Ka) and the pKa associated with phenolphthalein from the absorbance values obtained from phenolphthalein solutions at different pHs. The present protocol for the determination of the pKa takes a very short time and is useful when teaching in conditions with limited equipment. Fil: Alonso, Manuel. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina Fil: Chapela, Sebastián P.. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina Fil: Cristaldo, María L.. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina Fil: Nievas, Inés. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina Fil: Burgos Oliver Gamondi, Hilda I.. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina Fil: Stella, Carlos Alberto. Universidad de Buenos Aires. Facultad de Medicina. Departamento de Bioquímica Humana; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina |
description |
We here report a laboratory protocol for the determination of the pKa value of an acid by means of determinations obtained with a spectrophotometer. Students determine the acidity constant (Ka) and the pKa associated with phenolphthalein from the absorbance values obtained from phenolphthalein solutions at different pHs. The present protocol for the determination of the pKa takes a very short time and is useful when teaching in conditions with limited equipment. |
publishDate |
2010 |
dc.date.none.fl_str_mv |
2010-09 |
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/11336/15288 Alonso, Manuel; Chapela, Sebastián P.; Cristaldo, María L.; Nievas, Inés; Burgos Oliver Gamondi, Hilda I.; et al.; Determination of the pKa value of phenolphthalein by means of absorbance measurements; Scientific Research; Creative Education; 1; 2; 9-2010; 130-133 2151-4755 2151-4755 |
url |
http://hdl.handle.net/11336/15288 |
identifier_str_mv |
Alonso, Manuel; Chapela, Sebastián P.; Cristaldo, María L.; Nievas, Inés; Burgos Oliver Gamondi, Hilda I.; et al.; Determination of the pKa value of phenolphthalein by means of absorbance measurements; Scientific Research; Creative Education; 1; 2; 9-2010; 130-133 2151-4755 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/doi/10.4236/ce.2010.12020 info:eu-repo/semantics/altIdentifier/url/http://www.scirp.org/(S(i43dyn45teexjx455qlt3d2q))/journal/PaperInformation.aspx?PaperID=3018 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Scientific Research |
publisher.none.fl_str_mv |
Scientific Research |
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reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) |
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CONICET Digital (CONICET) |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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13.070432 |