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Zorluk: KolaySublimation, Magnetization, and Centrifugation

A laboratory technician needs to separate a dry solid mixture containing iron filings, ammonium chloride (NH4ClNH_4Cl), and fine sand. In what correct sequential order should the steps below be carried out from first to last?

  1. 1Pass a strong magnet through the dry mixture to attract and extract the iron filings.
  2. 2Heat the remaining dry mixture in an evaporating dish covered with an inverted funnel to sublime ammonium chloride (NH4ClNH_4Cl).
  3. 3Collect the unvaporized sand remaining at the bottom of the evaporating dish.

Cevap

The correct sequence of steps is: first, pass a strong magnet to remove the iron filings; second, heat the remaining mixture to sublime ammonium chloride (NH4ClNH_4Cl); third, collect the non-volatile sand residue.
The process begins with magnetization to extract ferromagnetic iron filings. Next, heating the remaining mixture causes ammonium chloride (NH4ClNH_4Cl) to sublime directly into vapor, leaving fine sand behind as the non-volatile residue.

Adım Adım Çözüm

1
Perform magnetization on the dry mixture.
Iron filings adhere to the magnet and are completely removed from the container.
Iron is ferromagnetic and can be physically isolated without affecting the other non-magnetic solids.
2
Apply heat to the remaining mixture using an inverted funnel collector.
Ammonium chloride (NH4ClNH_4Cl) sublimes into gas and re-crystallizes as solid deposit on the cool funnel surface.
Ammonium chloride readily sublimes upon heating, separating it cleanly from sand.
3
Isolate the remaining solid in the dish.
Pure sand remains in the evaporating dish.
Sand does not sublime under normal heating conditions and is non-magnetic, making it the final isolated component.

Anahtar Kavram

Sequential separation of solid mixtures by exploiting differences in magnetic property (magnetization) and thermal volatility (sublimation).
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Konular

Sublimation, Magnetization, and Centrifugation