Group III Cation Flow Chart
Group III Cation Flow Chart. Al 3+ , Cr 3+ , Fe 3+ , Ni 2+. Source of OH -. ( SKIP STEP 1). NaOH (aq) (excess) NaOCl (aq) [NaClO (aq) ] NH 3 (aq). Oxidizes Cr 3+ (cation) to CrO 4 2- (anion; can’t ppt with OH - !). (STEP 2). Ppt (solid): Fe(OH) 3 (s) , reddish brown (dark)
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