Antocianinas como indicador Acido base natural (Repollo morado o Col lombarda)
Los alumnos de 3er año realizaron una extracción acuosa de la col lombarda, esta solución de color violeta intenso, fue probada como indicador acido base, cambiando su coloración en presencia de ácidos y bases.
En química podemos clasificar las sustancias en ácidas, que tienen un sabor agrio y básico, que tienenun sabor amargo. Para conocer su carácter ácido o básico medimos el pH de la sustancia. Si el pH se encuentra entre 0 y 7, decimos que la sustancia es ácida, y si el pH se encuentra entre 7 y 14, decimos que la sustancia es básica.
En esta práctica nos planteamos medir el pH de una serie de sustancias que forman parte de nuestravida cotidiana. Además identificaremos el carácter ácido o básico de estas sustancias utilizando un indicador ácido-base natural: El extracto acuoso de la col lombarda (repollo morado) o rosas rojas ( 4 rosas).
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