Answer
When the hydrate has a higher Vapor Pressure than that of water vapor in the air, loss of water of hydration can occur. Examples of efflorescent hydrates include Copper Sulfate pentahydrate.
Work Step by Step
When the hydrate has a higher Vapor Pressure than that of water vapor in the air, loss of water of hydration can occur. Examples of efflorescent hydrates include Copper Sulfate pentahydrate.