My class needed some iron (iii) chloride to determine the purity of some aspirin they synthesized, so I thought I might try making some. I left a strip of iron in concentrated HCl for a few nights under the fume hood. I was expecting a liquid with iron (ii) chloride to result, which would then gradually turn into iron (iii) chloride with time. What I got was a light greenish snow-like solid substance accumulating in the bottom of the beaker (regrettably did not get any pictures). I filtered this off, but now I am wondering exactly what it was. Nothing went into the beaker but the 9 g Fe strip and about 100 ml of 12 M HCl. The solution I ended up with performs like iron (iii) chloride, it will turn salicylic acid a purplish color. It is a very dark brown liquid that leaves yellowish trails on the sides of its container. I'm going to do a titration to get its exact concentration. I should've had a bunch of excess HCl since Fe was limiting the reaction. Could I have saturated the solution with iron (ii) chloride?