Ref: Shakhashiri, v.1, p. 299

SP05 Prof. Stacy - follow Shakhashiri procedure A, except KCN last step.

Modified for Prof. Pines (note change in discussion)

Prepare in advance: 

	(2) 500 ml Erl. flask w/300ml each water
	to each, add 20 ml 1M NiSO4

	5M NH4OH, aqueous
		(for 6 demos, dilute 200 ml 6M to 240 ml)
	25% ethylenediamine, aqueous
		(for 6 demos, dilute 100 ml 30% to 120 ml)

Demo procedure (see modifications below):

	To first Erl. flask, add 40 ml NH4OH, note color
	Add 20 ml ethylenediamine, note color

	To second Erl. flask, add 20 ml ethylenediamine, note color, 
	Add 40 ml NH4OH, note color

Keywords: 

	precipitate, complex, nickel(II), equilibrium, 

Discussion:
	(FL99 -- change to addition of 25ml each instead of 
	40 and 20 as above.)

	(FL01 -- change to addition of 25ml each instead of 
	40 and 20 as above.)
	(change also add additional 300ml NiSO4 flask for
	std. Additional changes tbd.)

Demo procedure (modified FL01) - USE THIS VERSION:

	To first Erl. flask, add 25 ml NH4OH, note color - blue
	To second Erl. flask, add 25 ml ethylenediamine, note color - purple

	To second Erl. flask, add 25 ml NH4OH, note color - purple
	To first Erl. flask, add 25 ml ethylenediamine, note color changes 
		to purple