# Describe how you would separate a mixture of water, sand and iron metal filings. Which separation techniques would you use?

$F e \left(s\right) + 2 H C l \left(a q\right) \rightarrow F e C {l}_{2} \left(a q\right) + {H}_{2} \left(g\right) \uparrow$
Sand, $S i {O}_{2}$ to a first approximation, is very inert, and only specialty acids (for instance $H F$) would touch it.