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Gdansk, 29th of November, 2006. GDANSK UNIVERSITY OF TECHNOLOGY Cation Analysis Report for Chemistry Laboratories Name: Marta Stawska Index number: 108482 Group: III EPM Sample number: 4 Discovered cations in the sample Group Cations I Pb2+ Lead IIA Cd2+ Cadmium III Mn2+ Manganese(II) IV Ca2+ Calcium V K+ Potassium Sample number: 4 GENERAL DESCRIPTION OF ANALYTICAL GROUPS Cations are classified into five groups on the basis of their behavior against some reagents. By the systematic use of these, so called group reagents, we can conclude about the presence or absence of groups of cations in solution. We can also separate these groups for further examination. Classification is based on whether a cation reacts with these reagents with the formation of precipitate or not. Therefore it can be said that classification of the most common cations is based on the differences of solubility of their chlorides, sulfides, and carbonates. The group reagents used for classification of most common cations are: hydrochloric acid, hydrogen sulfide ( which is said to be toxic but is much...

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