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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

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.

  • 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.


SLIKE

  • PRIJE POKUSA:


SLIKA

  • POSLIJE POKUSA:


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


ZAKLJUČAK

  • nastala je lužina,

  • dokazali smo fenolftaleinom


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