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Intranet

Pistes que desapareixen

Objectiu: Fer desaparèixer el que hem escrit en un paper

  • Materials de laboratori

    hisops de cotó

    Vases de precipitats

    Llibre blanc

  • Reactius

    Betadina

    Vitamina C (tableta efervescent)

    Aigua

  • Preguntes

    Què s'absorbeix en reescriure el missatge?

    Quina reacció química està tenint lloc?

Procediment

  • Satura el cotó amb la solució de iode i escriu un missatge en un full de paper en blanc.
  • Dissoleu algunes pastilles de vitamina C en aigua.
  • Aboqueu l’altre cotó net a la solució de vitamina C i torneu a escriure el missatge anterior. Observa què passa.

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