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2. SiO₂+4HF--->SiF₄+2H₂O - fluorek krzemu(IV) i woda
3. SiO₂+CaO--->CaSiO₃ - krzemian(IV) wapnia
4. SiO₂+Na₂O--->Na₂SiO₃ - krzemian(IV) sodu
5. Na₂SiO₃+2HCl--->H₂SiO₃+2NaCl - kwas krzemowy i chlorek sodu