Solvate isomerism: Hydrate isomerization

Solvate isomerism is somewhat similar to ionization isomerism but involves the interchange of a solvent molecule with a negative ion. This type of isomerism is demonstrated by the three modifications of the composition CrCl3.6H2O. One modification does not lose water when stored over concentrated H2SO4 (as a dehydrating agent). Its molar conductance is of the same order as that of trivalent salt, indicating the presence of a tripoistive complex ion and three mononegative chloride ions. All the chloride content is immediately precipitated as AgCl by the AgNO3 solution. These properties of the isomers indicate their formula.

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The second modification loses one mole of water per mole when stored over conc. H2SO4. Its molar conductance corresponds to that of a bivalent state, indicating the presence of a dispositive complex ion and two chloride ions. These properties correspond to the formula.

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The third modification, based on its properties, is formulated as

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Examples of Solvate isomerism

solvate isomerism
examples of solvate isomerism

When a negative groups gets exchanged for a water molecule, the isomerism is more specifically called hydrate isomerism. An example involving both ionization and hydrated isomerism is provided by the following pair of complexes.

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