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Meta-nitrobenzoic acid and para-nitrobenzoic acid can be separated using their differing solubility in polar solvents. A typical method involves dissolving the mixture in a solvent like water or ethanol, where para-nitrobenzoic acid is more soluble than meta-nitrobenzoic acid. Upon cooling or adding a non-solvent, meta-nitrobenzoic acid will precipitate out, allowing for filtration and separation. Further purification can be achieved through recrystallization.

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