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Intranet

Monedes impecables

Objectiu: netejar l’òxid present a les monedes de coure

  • Materials de laboratori

    3 plaques de Petri

    3 monedes de coure

    Paper de pH

  • Reactius

    vinagre

    Sal

    Aigua

  • Preguntes

    Què es pot observar? Què està passant?

Procediment

  • A la primera placa de Petri, poseu una capa de vinagre (prou per cobrir la moneda completament). En el segon plat, afegiu-hi una capa de vinagre saturat de sal.
  • En el tercer plat, afegiu només aigua amb sal.
  • Col·loqueu una moneda de coure a cada placa de Petri de manera que quedi completament coberta pel líquid. Espereu 1-2 minuts i observeu què passa.
  • Mesura el pH de les tres solucions amb paper de pH.
  • Rentem bé les monedes amb aigua i les assequem amb paper.

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