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The gas evolved on heating CaF$$_2$$ and SiO$$_2$$ with concentrated H$$_2$$SO$$_4$$, on hydrolysis gives a white gelatinous precipitate. The precipitate is:
$$\text{CaF}_2 + \text{H}_2\text{SO}_4 \longrightarrow \text{CaSO}_4 + 2\text{HF}$$
$$\text{SiO}_2 + 4\text{HF} \longrightarrow \text{SiF}_4 \uparrow + 2\text{H}_2\text{O}$$
$$3\text{SiF}_4 + 4\text{H}_2\text{O} \longrightarrow \mathbf{\text{H}_4\text{SiO}_4} + 2\text{H}_2\text{SiF}_6$$
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