Identification Tests Manganese

Identification A 1 20 aqueous solution gives positive tests for Manganese and for Chloride, Appendix IIIA. 

Identification A 1 20 solution in 2.7 A hydrochloric acid gives positive tests for Manganese, Appendix IHA. 

Identification A 1 20 aqueous solution gives positive tests for Manganese and for Hypophosphite, Appendix IIIA. Assay Not less than 97.0% and not more than 100.5% of Mn(H2P02)2 after drying. 

This sensitive reaction, which is used for the detection of manganese (see page 300), may also be used to detect periodates. The identification of small amounts of permanganate is accomplished by the use of tetrabase (tetramethyl-/>-diaminodiphenylmethane) a blue quinoidic oxidation product is formed (see page 280). Chlorates, bromates, and iodates do not interfere with the test. Persulfates react with manganese salts, giving... 

Procedure. A drop of the neutral test solution is placed on a spot plate, followed by a drop of saturated potassium periodate solution, a drop of 2 iST acetic acid, and two drops of 1% solution of tetrabase in chloroform. According to the amount of manganese present, a more or less deep blue color is formed. Limit of Identification 0.001 y manganese Limit of Dilution 1 50,000,000... 

Flame tests are not commonly used to identify transition metals. The presence of a certain transition-metal ion in a solution is sometimes obvious from the solution s color. Some transition-metal ions can be more accurately identified using a procedure called qualitative analysis. Qualitative analysis is the identification of ions by their characteristic reactions. The transition-metal ions most often identified through qualitative analysis include copper, nickel, zinc, chromium, iron cobalt, cadmium, manganese, and tin. Most tests to identify the presence of an ion in a mixture involve causing the ion to precipitate out of solution. Some of the more dramatic precipitation reactions for transition metals are shown. 

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