What happens when iron nail reacts with copper sulphate

Will the mass of the beaker and its contents stay the same throughout the displacment reaction?

The reaction:

Fe + CuSO4 -> FeSO4 + Cu

Or easier:

Fe + Cu 2+ -> Fe 2+ + Cu

The concentration of SO4 2-, hence the concentration of the solution stays the same. However, the mass of the nail increases, and the mass of the sulubility decreases with the same amount.