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Only the simultaneous analysis of the amount of Fe2- and the possible presence of Fe3+ in ferrous sulfate heptahydrated (FeSO4. 7 H2O) can guarantee covered tablets, drops or syrups with insured quality. This work suggests that these analysis are accomplished through spectrophotometric method by use of the 1, 10-phenanthroline as chelate. Thus, at 510 nm the absorption is only due to the complex of the ligand with Fe2- and at 390 nm the absorption is indicative of Fe2+/3+ coordinated. Pharmaceutical raw matter and covered tablets were analyzed. Techniques of thermogravimetric analysis (TG-DTG) were used for the knowledge of the regions of loss of water of the FeSO4. 7 H2O for the relationship to its stoichiometry.