The phthalic acids

....1,2-benzenedicarboxylic acid.. ...1,3-benzenedicarboxylic acid.. ..1,4-benzenedicarboxylic acid..

m.p. 230oC

m.p. 230oC

sublimes 402oC

1 g dissolves in 160 ml water

1 g dissolves in 160 ml water

insoluble in water