4HF + SiO2 =SiF4 + 2H2O
Ca3(PO4)2 + 3H2SO4 = 3CaSO4 + 2H3PO4
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4HF + SiO2 =SiF4 + 2H2O
Ca3(PO4)2 + 3H2SO4 = 3CaSO4 + 2H3PO4