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Intranet

Pilota inflada

Objectiu: Preparar una pilota inflable

  • Materials de laboratori

    1 got de plàstic

    Vareta de vidre

    Cilindres graduats

  • Reactius

    Silicat de sodi (Na 2 SiO 3 )

    Etanol

    Aigua

    Colorant alimentari

  • Seguretat

    No oblideu els guants, la bata de laboratori i les ulleres de seguretat!!!

  • Preguntes

    Quin tipus de reacció té lloc?

Procediment

  • Afegiu 20 ml de solució de silicat de sodi en un got de plàstic i afegiu-hi una gota de colorant alimentari.
  • Afegir 5 ml d’etanol i remenar amb la vareta de vidre, fent moviments circulars fins a obtenir un sòlid tou.
  • Agafeu el sòlid amb el palmell de la mà (usant guants) i doneu-li forma a una bola, vigilant que no es desfà. De tant en tant, podem humitejar la barreja amb una mica d’aigua.
  • NOTA: Aneu amb compte de no barrejar els tubs d’assaig. Un per etanol i l’altre per silicat.

Explicació teòrica

Quan el silicat de sodi es combina amb l’etanol, les molècules de silicat (monòmers) comencen a unir-se, formant cadenes que anomenem polímers. Aquesta reacció s’anomena polimerització. Les cadenes es van formar finalment entrecreuades, formant xarxes tridimensionals que fan que el material s’endureixi i passi d’un líquid a un sòlid.

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