# Water molecules in CuSO4.5H2O

1. May 5, 2014

### utkarshakash

1. The problem statement, all variables and given/known data
How many water molecule in CuSO4.5H2O attached only by coordinate bond?

3. The attempt at a solution

Copper exists in the form of Cu2+. So, it has one vacant d-orbital. The answer should then be 1. But it's 2 :(

2. May 6, 2014

### Saitama

Copper can form complexes but I don't see how the answer is 2. To my knowledge, it exists as $[Cu(H_2O)_4]^{+2}SO_4^{2-}\cdot H_2O$. Hence, the answer should be 4.