The secondary valency and the number of hydrogen bonded water molecule(s) in CuSO₄·5H₂O, respectively, are:

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Strategy:
 Recall the structural formula of blue vitriol (copper sulfate pentahydrate) to determine its primary and secondary valencies and hydrogen bonding.

Step 1: Structure of 
The complex is formally written as .

Step 2: Secondary Valency
The secondary valency refers to the coordination number. The  ion is coordinated to 4 water molecules.
Secondary valency = 4.

Step 3: Hydrogen bonded water
The 5th water molecule resides outside the coordination sphere and is held via hydrogen bonds to t

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