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POKUS

POKUS. ŽARENJE PUŽEVE KUĆICE Marko M., Željana G., Toni M. 8.razred, 2013./14. PRIBOR:plemenik,štrcaljka,mala čaša,velika čaša,hvataljka. KEMIKALIJE:puževa kućica(vapnenac) i fenoftalein.

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POKUS

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  1. POKUS ŽARENJE PUŽEVE KUĆICE Marko M., Željana G., Toni M. 8.razred, 2013./14.

  2. PRIBOR:plemenik,štrcaljka,mala čaša,velika čaša,hvataljka. • KEMIKALIJE:puževa kućica(vapnenac) i fenoftalein. • POSTUPAK:hvataljkom smo uzeli puževu kućicu i zagrijavali je, nakon što je pobijelila odmah smo je stavili u hladnu vodu s fenoftaleinom, promjenila se boja otopine u ljubičastu.

  3. SLIKE • PRIJE POKUSA:

  4. SLIKA • POSLIJE POKUSA:

  5. ZAPAŽANJE • puževa kućica (vapnenac) žarenjem promijenila boju u bijelu(nastao CaO), • CaCO3(s) CaO(s) + CO2(g) • CaO u vodi fenoftalein u ljubičastu. • CaO + H2O  Ca(OH)2

  6. ZAKLJUČAK • nastala je lužina, • dokazali smo fenolftaleinom

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