I suspect you had a specific lab you did, and had a specific nickel complex formed.
http://www.youtube.com/watch?v=hDt2OUnOcug&feature=player_embedded
a)what is the name and molecular formula of the reagent responsible for the formation of the nickel complex ions?
b)What is the color of this complexation?
2 answers
oh um. it was Ni(OH)2 forming a green solid.