A solid mixture consists of iron filings, ammonium chloride, and sodium chloride. Arrange the following laboratory steps in the correct chronological order to separate each component and isolate pure sodium chloride crystals.
- 1Pass a magnet through the dry solid mixture to extract the magnetic component.
- 2Heat the remaining mixture in an evaporating dish covered with an inverted funnel to collect the sublimated vapor.
- 3Add distilled water to the remaining solid, stir thoroughly, and filter the mixture.
- 4Evaporate the clear filtrate to dryness to obtain sodium chloride crystals.
Cevap
The correct separation sequence is: 1. Remove iron filings using a magnet, 2. Sublimate ammonium chloride by heating, 3. Dissolve the residual salt in water and filter, 4. Evaporate the filtrate to collect sodium chloride crystals.
The correct order proceeds from dry physical removal to thermal transformation and finally solution-based separation. First, dry magnetization removes ferromagnetic iron filings without wetting the mixture. Second, thermal heating sublimates volatile ammonium chloride directly into gas, leaving non-volatile sodium chloride behind. Third, adding water dissolves sodium chloride, allowing filtration of insoluble residue. Finally, evaporating the filtrate recovers pure sodium chloride crystals.
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Anahtar Kavram
Sequential separation of mixtures utilizing magnetization, sublimation, dissolution, filtration, and evaporation based on physical properties.