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by
Marin Čičak
5 years ago
394
Kalcij i njegovi spojevi
Kalcium och dess föreningar spelar en viktig roll inom olika områden som hushåll, medicin och byggande. Kalciumoxid, även känt som bränd kalk, reagerar med vatten för att bilda kalciumhydroxid, vilket används i murbruk och kalkmjölk.
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Kalcij i njegovi spojevi
Kalcijev sulfat dihidrat (gips, sadra), CaSO4 * 2H2O
medicina, građevinarstvo, šk. kreda
dodatkom vode povećava se volumen
CaSO4 * 2H2O(s) ⇄ CaSO4 * 0,5H2O(s) + 1,5H2O(l)
Kalcijev klorid, CaCl2
kućanstvo, posipanje po cesti
Solvayev postupak dobivanja sode
Kalcijev hidroksid (gašeno vapno), Ca(OH)2
Ca(OH)2(s) + CO2(g) → CaCO3(s) + H2O(l)
žbuka, vapneno mlijeko
Kalcijev oksid (živo vapno), Cao
CaO(s) + H2O(l) → Ca(OH)2(s)
Kalcijev karbonat, CaCO3
CaCO3(s) + CO2(g) + H2O(l) ⇄ Ca(HCO3)2(aq)
Žarenjem vapnenca dobivamo kalcijev oksid
Polimorfi su kalcit i aragonit