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Intranet

Cúpula de agua

Objetivo: Observar los efectos de la tensión superficial del agua cuando colocamos gotas de agua encima de una moneda

  • Material de laboratorio

    Vaso

    Pipeta

    Moneda

  • Reactivos

    Agua

    Colorante alimentario (opcional)

    Jabón de fregar

  • Preguntas

    ¿Cuántas gotas has podido colocar? ¿Es lo que esperabas?

    ¿De qué depende el número de gotas?

    Al añadir gotas de agua con detergente, ¿has observado alguna diferencia? ¿Por qué?

Procedimiento

  • Vierte agua en el vaso de precipitados.
  • Añade un par de gotas de colorante alimentario (opcional).
  • Coge una moneda y lávala bien para eliminar cualquier resto de suciedad (sécala bien para obtener mejores resultados).
  • Colocad la moneda sobre una mesa y preguntaos cuántas gotas podríamos poner encima sin que se derramara. A ver quién adivina o se acerca más al número correcto.
  • Lentamente, sigue añadiendo las gotas de agua y observa la increíble forma de cúpula que forma el agua.
  • Ahora, añade unas gotas de detergente al agua del vaso, mezcla y repite el experimento.

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