Subject: Hydrated salts

Is there an 'activity series' for hydrated salts?  In other 

words, would a certain anhydrous salt remove water from a 

hydrated salt to form its own hydrate? Also, if two salts

that did not form hydrates undergo a double displacement

reaction to form one that does?  Or would two hydrated salts 

dissolved in water undergo a double displacement reaction to 

form a salt that does not form a hydrate?

Re: Hydrated salts