Transition metal solutions. Various laboratory flasks with solutions of transition metal salts. Compounds containing transition metals are often colored. Left to right: cobalt chloride (CoCl2) in a capped vial, chromium(III) potassium sulfate (KCr(SO4)2) in a beaker, ammonium metavanadate(V) (NH4VO3) in a flat-bottom boiling flask, nickel sulfate (NiSO4) in a graduated cylinder, potassium permanganate (KMnO4) in an Erlenmeyer flask, potassium dichromate(VI) (K2Cr2O7) in a volumetric flask, iron(III) chloride (FeCl3) in a reagent bottle, copper sulfate (CuSO4) in a beaker.
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