Groups A & B – Working Together:

1.  Record Data from other Group.

2.  At the appropriate wavelength (determined in Part A):
a.  Zero the spectrophotometer.
b.  Place the cuvette with the 0.5M HNO3 in the holder
and adjust the light control knob to 100%. 
Remove the cuvette.
c.  Place the cuvette with the solution in the holder.
d.  Record the % Transmittance on Datasheet 1.
e.  Pour the solution out of the cuvette back into the
beaker of ÒDiluted Fe3+ Ó. 

3.  Pipet another 5.00 ml of KSCN into the beaker
of ÒDiluted Fe3+ Ó.  Stir well.

4.  Pour ~8 ml of solution into a cuvette.

5.  Place the cuvette with the solution in the holder.

6.  Record the % Transmittance on Datasheet 1.

7.  Pour the solution out of the cuvette back
into the beaker of ÒDiluted Fe3+ Ó. 

8.  Repeat steps 14-18 to obtain the remaining data.