AP Chemistryeasymcq1 pt

Which technique best recovers pure, solid NaCl from an aqueous NaCl solution?

A.Filtering the solution through filter paper

B.Evaporating the water so the salt crystallizes behind

C.Decanting after letting the mixture settle overnight

D.Adding oil to extract the salt into an organic layer

Explanation

Core Concept

Separations exploit physical-property differences. Water boils at 100 degrees Celsius while sodium chloride is involatile and thermally stable, so gently heating the solution vaporizes the solvent and deposits solid crystals. Filtration cannot work because dissolved ions travel freely through any filter medium with the liquid. Decanting fails likewise, since a true solution never settles into separable layers.

Correct Answer

BEvaporating the water so the salt crystallizes behind

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