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Iminodisuccinic acid (IDA) is more soluble in water than fumaric acid. This is due to the presence of the amine group (-NH-) in IDA, which can form hydrogen bonds with water molecules. Fumaric acid, on the other hand, only has carboxyl groups (-COOH), which can also form hydrogen bonds, but to a lesser extent than the amine group. The increased hydrogen bonding capability of IDA makes it more soluble in water.