In an experiment from last semester, many of you observed a green solution containing [Ni(H2O)6]2+.

In an experiment from last semester, many of you observed a green solution containing [Ni(H2O)6]2+. Upon adding ethylenediamine (en), you observed a blue (blue) solution containing [Ni(en)2(H2O)2]2+. What does this indicate about the relative size of the crystal field splitting for the water ligand compared to the ethylenediamine ligand? And how do you know?