(Excuse spelling of thread name). 1.) If i originally had CaCl2 . 6H20 + HCl solution (which is deep purple in color), then added distilled water which caused a rose pink color, then: Is there a source of "stress"? That is, is adding water also adding stress to a system? Or is the change in color from purple to pink simply a matter of dilution (water causes the solution to dilute, thus making the purple color faint and hence pink)? Also, if there is in fact a stress, what is the direction of the equilibrium shift? 2.) If i have a mixture of 0.2 M FeCl3 and 0.2 M KSCN (mixed together) in four beakers, and did the following to each: a.) Add KCl. b.) Add Fe(No3)3 c.) Add KSCN. d.) NaOH Then what would be the stress in each and the direction of the equilibrium shift? For a.), the color was changed from light amber to an even lighter amber. For b.) the color was changed to red. For c.) darker red. And for d.) Lemon-yellow. I guess my second question is a more general one. I don't seem to understand how to investigate the effects of the reagents on the equilibrium reaction. The only one i seem to understand is KSCN, because KSCN is in fact part of the original reactants; thus, adding KSCN will contribute to the forward reaction. Thank you.