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El siguiente articulo se encuentra enmarcado en experiencias de laboratorio que se orientan desde diagramas de flujo muy sinteticos e ilustrativos, que promueven un acercamiento al concepto estructurante de pH, y su relacion con el comportamiento acido-base y las soluciones buffer. Para la ensenanza de dichos conceptos, se efectuo la elaboracion y estandarizacion de tres tipos de papel indicador de pH, utilizando sustancias naturales, tales como la col lombarda, los petalos de rosa roja y el curry, insumos de facil consecucion y cuyo comportamiento quimico permite la consolidacion de este tipo de conceptos estructurantes, aspecto que fue evidenciado en su posterior aplicacion a una serie de sustancias de uso cotidiano, en diversos rangos de la escala de pH, lograda desde una coleccion de soluciones amortiguadoras preparadas por los estudiantes.Palabras clave: Experiencia de laboratorio; concepto estructurante; pH; comportamiento acido-base; soluciones buffer, papel indicador.Indicator paper made of natural excerpts: an alternative based on laboratory experiences for learning of the pH conceptThis article is framed in laboratory experiments directed from synthetic and illustrative flowcharts, which promote a structured approach to the concept of pH, and their relation with the acid- base behavior and buffer solutions. To teach such concepts, it was necessary the development and standardization of three types of pH indicator paper as well as the use of natural substances such as red cabbage, red rose petals and the curry which are easily found in the market and present a chemical behavior that allows the consolidation of such structuring concepts. This aspect was evident in the subsequent application to a number of substances for everyday use, in several ranges of the pH scale, achieved from a collection of buffer solutions prepared in advanced by students.Key Words: Lab experiences; structuring concepts; pH, acid-base behavior; buffer solutions; indicator paper

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Elaboración de papel indicador a base de extractos naturales: una alternativa fundamentada en experiencias de laboratorio para el aprendizaje del concepto de pH