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What are hydrate isomers? Explain with an example.

Answer»

The exchange of free solvent molecules such as water, ammonia, alcohol etc., in the crystal lattice with a ligand in the coordination entity will give different isomers. These type of isomers are called solvate isomers. If the solvent molecule is water, then these isomers are called hydrate isomers. For example, the complex with chemical formula CrCl3. 6H2O has three hydrate isomers as shown below.

[Cr(H2O)6]Cl3a violet colour compound and gives three chloride ions in solution,
[Cr(H2O)5Cl]Cl2.H2Oa pale green colour compound and gives two chloride ions in solution and,
[Cr(H2O)4Cl2]Cl.2H2Odark green colour compound and gives one chloride ion in solution


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