Purification: crystallization, distillation, sublimation, chromatography (intro)
Practical Organic Chemistry · Chemistry
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Separate a mixture of benzoic acid and naphthalene. Choose the method. Step 1: Naphthalene sublimes (solid → vapour on heating); benzoic acid doesn't easily. Step 2: Heat the mixture gently — naphthalene vapours deposit as crystals on cool surface. Step 3: Benzoic acid stays behind. Step 4: Alternatively: NaHCO₃ dissolves benzoic acid (→ benzoate), naphthalene filtered. Two routes — pick by property!