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Agua dura y blanda

¿Qué sabes sobre la dureza del agua?

Después de leer atentamente la información anterior, contesta las siguientes preguntas.

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7
Su navegador no es compatible con esta herramienta.

Laboratorio virtual para determinar la dureza del agua

En el siguiente enlace vas a encontrarte en un laboratorio virtual en el que podrás determinar la dureza de una muestra de agua. Sigue las instrucciones atentamente y contesta los retos que se plantean. Puede que alguno de ellos te dé alguna pista.

Comienza localizando las instrucciones que tienes que seguir. Toma las notas que consideres necesarias.

Instrucciones

Las instrucciones te explican la reacción química que nos sirve para determinar la concentración de los iones calcio y magnesio en la muestra de agua. El AEDT es un compuesto orgánico que reacciona con estos iones según las ecuaciones químicas:

reacción de valoración con EADT
Imágenes captadas del laboratorio virtual

Los indicadores son sustancias que, al cambiar de color, nos indican que ya ha reaccionado todo el calcio o el magnesio presente y que la valoración ha concluido. 

Las instrucciones para la simulación aparecen al iniciarla. Por si necesitas consultarlas, te las incluimos aquí:

instrucciones programa
Imagen captada del laboratorio virtual

Localiza el cuadernillo de prácticas y lee los pasos que has de seguir para realizar la valoración.

Cuadernillo de prácticas

Si no localizas el cuadernillo, y como referencia, aquí tienes los pasos:

  1. Prepárate para trabajar de forma segura en el laboratorio. El material de seguridad se encuentra en la zona de pesada. Puedes encontrar el cuaderno de laboratorio en uno de los bancos de trabajo.
  2. Prepara 250 mL de disolución 0.01 M de reactivo valorante AEDT. Realiza los cálculos necesarios para saber qué masa de AEDT debes pesar. Deja todo limpio y recogido en las zonas de pesada y preparación.
  3. Toma la muestra de agua procedente del manantial.
  4. Toma una alícuota de 100 mL de muestra y añade los reactivos y el indicador necesarios para la valoración del calcio.
  5. Realiza la valoración complexométrica para determinar la concentración de Ca2+. Deja todo limpio y recogido.
  6. Toma otra alícuota de 100 mL y añade los reactivos y el indicador necesarios para la determinación de calcio más magnesio (dureza total).
  7. Realiza la valoración complexométrica con AEDT para determinar Ca2+ y Mg2+ (dureza total). Realiza los cálculos necesarios para expresar la dureza total como mg/L de CaCO3. Coteja con los valores de la tabla para determinar la calidad del agua de acuerdo con su dureza.
  8. Finalmente, calcula, por diferencia, la concentración de magnesio en el agua y exprésala en mg/L.

Informe final

Al finalizar las valoraciones, deberás emitir un informe del análisis, que puedes descargar y rellenar en pdf más adelante.

Indica a continuación los resultados de tu informe.

informe
Imagen captada del laboratorio virtual

La calidad del agua se clasifica como .

La concentración de iones calcio es mg/L.

La concentración de iones magnesio es mg/L.

La dureza total es de mg/L.

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Financiado por la Unión Europea — Ministerio de Educación y Formación Profesional (Gobierno de España) — Plan de Recuperación, Transformación y Resiliencia