1. Add 0.5 mL of 0.10 M NiCl2 solution to each of 7 test tubesusing dropper provided. Label these tubes 1 through 7. 2. Add thefollowing to the respective tubes containing the NiCl2solution,
Tube 1: 5 drops of water (used here as a control experiment fordilution)
Tube 2: 1 mL of conc. HCl
Tube 3: 5 drops of conc. ammonia
Tube 4: 5 drops of dilute (5% v/v) ethylenediamine solution
Tube 5: 5 drops of 0.25 M C2O4 2- (oxalate) solution
Tube 6: 5 drops of 0.1 M SCN- (thiocyanate) solution
Tube 7: 5 drops of 0.1 M EDTA solution Mix each solutionthoroughly and be sure to note the colour of each tube.
3. Check the stability of each complex by adding 3-5 drops of 1M NaOH solution. Note any changes (e.g., formation of precipitate,colour change, etc.)
4. Add 0.5 mL of 0.10 M CuSO4 solution to each of 7 new testtubes labeled 8 through 14 using dropper provided. Repeat steps 2and 3.
The “field strength†of a ligand describes how strong thecoordination bond is, for a given metal and the ligand that isconsidered.  The field strength is evaluated byconsidering how much it causes the d orbitals to split (DE), whichof the ligands is strongest?  Which is theweakest?  Explain your choices in each case.
