How does vermiculite lose and regain water molecules during dehydration?

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SUMMARY

Vermiculite is a mineral that loses its water molecules upon heating but does not completely eliminate them. The process involves the water of hydration, which is chemically bound to the mineral structure. Even drying vermiculite in an oven at temperatures exceeding 100°C may not fully remove this water. Understanding the behavior of water in vermiculite is crucial for applications in horticulture and construction.

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vermiculite a mineral loss its water molecules when its is heated but it not loses it water molecules completely.how it is possible??
 
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You are talking about water of hydration.

Example Si0_2 3(H_20)

google for water of hydration. Even oven drying to > 100C may not remove it.
 
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