What does sodium phthalate give on reaction with sodalime?
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Sodalime decarboxylation is a common method to convert sodium salts of carboxylic acids into hydrocarbons. For dicarboxylic acids or their salts, if both carboxyl groups are removed, the resulting hydrocarbon will have two fewer carbons than the original acid if it were aliphatic, or result in the base aromatic ring if it was an aromatic dicarboxylic acid like phthalic acid.