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What are crystalline hydrates? Explain it with example.

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1. In these, hydrogen bonding is very important. Often the water molecules serve to fill in the interstices and bind together structure.

2. A specific example is CuSO. 5H2O.

3. Although there are five water molecules for every divalent copper ion, only four are coordinated to the cation, it’s six-coordination being completed from sulphate anions. The fifth water molecule is held in place of hydrogen bonds, O – H – O, between it and two coordinated water molecules and then coordinate sulphate anion. 

4. Water forms hydrated salts during crystallization.

Examples, Na2CO3 . 10H2O, FeSO4 .7H2O. 

5. The water present in the hydrates is called as water of hydration.

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