... or tank vehiCle appearance : Brownish liquid · Chemical name : Ferric chloride solution· Molecular formula : FeCl3· Molecular weight : 162.21· ... of cost compared with liquid/solid aluminum sulfate, polyaluminum chloride, polyferric sulfate.•Good flocculation property, with faster sedimentation ... soluble in water, %≤0.5Free acid (HCl) %≤0.5Cu, %≤0.1Zn, %≤0.1Cr, %≤0.1Pb, %≤0.1 Ferric chloride solution