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Objectiu: Obtenir un precipitat dins de l’aigua carbonatada
Materials de laboratori
Tubs d'assaig
Vases de precipitats
Pipetes
Reactius
Hidròxid de calci (Ca(OH) 2 )
Aigua carbonatada
Seguretat
No oblideu els guants, la bata de laboratori i les ulleres de seguretat!!!
Preguntes
Què es pot observar quan es barregen els dos líquids?
Quina reacció té lloc?
Procediment
Explicació teòrica
L’hidròxid de calci transporta els ions Ca 2+ i OH – . En aquest cas, tots dos ions participen en la reacció. L’aigua mineral carbonatada transporta CO 2 dissolt. La reacció que té lloc és la següent:
CO 2 + Ca 2+ + 2 OH – CaCO 3 + H 2 O
El carbonat de calci no és soluble en aigua i forma un precipitat.
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