# How react is SiO_2?

$S i {O}_{2}$ is fairly unreactive stuff.
There are few materials as unreactive as silicon dioxide, quartz (or sand). Unlike carbon dioxide, silicon dioxide is a non-molecular substance that features $S i - O$ bonds that extend along the lattice. $S i {O}_{2}$ is VERY inert (i.e. UNREACTIVE). It will react with $H F$, but that's another story.
$S i {O}_{2} \left(s\right) + 6 H F \left(a q\right) \rightarrow S i {F}_{6}^{2 -} + 2 {H}_{3} {O}^{+}$