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Intranet

Somriure llim

Objectiu: Preparar slime amb materials quotidians

  • Material de laboratori:

    Vases de precipitats

    Espàtula

    Vareta agitadora de vidre

    Pipeta de plàstic

  • Reactius

    Cola blanca (que conté acetat de polivinil)

    tetraborat sòdic (bórax)

    Aigua

    Colorant alimentari

    vinagre

  • Preguntes

    Què passa quan es barregen les dues solucions? Quin tipus de substància es forma?

    Quines propietats s'observen en la massa viscosa?

    La barreja rebota? Què passa quan es submergeix en vinagre?

Procediment

  • Afegiu 20 g de cola blanca a un vas de precipitats.
  • Afegiu 2 gotes de colorant alimentari i remeneu-ho bé.
  • A continuació, afegim una mica de la solució de borax a la cola blanca mentre remenem contínuament amb la vareta de vidre fins a obtenir la consistència de llim.
  • Separa la massa viscosa i observa les seves propietats.
  • Intenta fer una pilota, què passa si la botam?
  • Agafeu una mica d’aquesta massa i submergiu-la en vinagre. Observa què passa.
  • Deixa assecar la pilota que has fet durant uns dies i després observa si les propietats han canviat.

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