Carbonate salts qualitative analysis

In similar circumstances, silver salts leave a residue of metallic silver lead and copper salts usually leave a residue of the corresponding oxide calcium and barium salts leave a resirlne of the carbonate or oxide. Identify the metal in all such cases by the usual tests of qualitative inorganic analysis. Metals other than the above are seldom encountered in elementan qualitative analysis. 

Seven chemical reactions were identified from the chemistry syllabus. These chemical reactions were selected because they were frequently encountered during the 2-year chemistiy course and based on their importance in understanding concepts associated with three topics, namely, acids, bases and salts, metal reactivity series and inorganic chemistry qualitative analysis. The seven types of chemical reactions were combustion of reactive metals in air, chemical reactions between dilute acids and reactive metals, neutralisation reactions between strong acids and strong alkalis, neutralisation reactions between dilute acids and metal oxides, chemical reactions between dilute acids and metal carbonates, ionic precipitation reactions and metal ion displacement reactions. Although two of the chemical reactions involved oxidation and reduction, it was decided not to include the concept of redox in this study as students had only recently been introduced to ion-electron... 

NMR is effective for qualitative analysis of ditallowdimethylammonium salts, as well as for determination of alkyltrimethyl- and trialkylmethylammonium impurities. Methyl and methylene carbons adjacent to the nitrogen are well resolved, and the chemical shift values differ measurably for methyl and methylene carbons of the various compounds (47). This method was demonstrated for impurities higher than about 2% (48). 

An analysis of solvent nucleophilicity29 suggests that steric factors should be taken into account in addition to electronic properties. For example, the Dn and Ds values for acetonitrile (Dn 14.1 and Ds 12) and propanediol-l,2-carbonate (Dn 15.1 and Ds 12) alone do not explain why acetonitrile dissolves salts more effectively than propanediol-l,2-carbonate. However, a consideration of steric effects suggests, at least qualitatively, that the small, rod-shaped acetonitrile molecule will be more effective in solvation than the larger, bulky propanediol-l,2-carbonate molecule. 

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