366 PRACTICAL ORGANIC CHEMISTRY HCl. Cool again and add a few drops of FeCl 3 solution. A deep brown-red coloration is produced immediately. Succinic Anhydride and Phthalic Anhydride. To distinguish these anhydrides from the corresponding acids, note that succinic anhydride (m.p. 120°) is almost insoluble in cold water, whereas succinic acid (m.p. 185°) is readily soluble. Phthalic anhydride has m.p. 132° and phthalic acid has m.p. 196-199° with decomposition. Each of these anhydrides when heated with water hydrolyses to the corresponding acids. Both succinic and phthalic anhydride respond to the hydroxamic acid test (see 5 above). The fluorescein test for succinic acid (p. 349) and the phthalein and fluorescein tests for phthalic acid (p. 351) are obviously given also by succinic anhydride and phthalic anhydride, as these tests depend upon the initial formation of the anhy-dride in each case. CRYSTALLINE
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