A laboratory mixture contains iron filings, saw-dust, and common salt. Which sequence of physical separation…
A laboratory mixture contains iron filings, saw-dust, and common salt. Which sequence of physical separation methods will cleanly isolate all three substances?
Dissolve mixture in water $\rightarrow$ Magnetic separation $\rightarrow$ Evaporation
Magnetic separation $\rightarrow$ Add water to remaining mix and filter $\rightarrow$ Evaporate filtrate
Winnowing $\rightarrow$ Sieving $\rightarrow$ Magnetic separation
A magnet first removes iron filings. Adding water dissolves the salt while saw-dust remains insoluble. Filtration collects saw-dust on the filter paper, and evaporating the liquid filtrate leaves pure salt.