Add time:08/22/2019         Source:sciencedirect.com

Publisher SummaryThis chapter deals with the purification of inorganic compounds and the purification of metal-organic compounds which includes ammonium and metal salts of organic acids. The most common method of purification of inorganic species is by recrystallization, usually from water. But, especially with salts of weak acids or of cations other than the alkaline and alkaline earth metals, care must be taken to minimize the effect of hydrolysis. This can be achieved by recrystallizing acetates in the presence of dilute acetic acid. There are many inorganic chemicals that are too insoluble or are hydrolysed by water; in that case no general purification method can be given. Many inorganic substances have large temperature coefficients for their solubility in water, but in other cases recrystallization is still possible by partial solvent evaporation. Organo-metallic compounds, on the other hand, behave very much like organic compounds, e.g. they can be redistilled and may be soluble in organic solvents. Careful handling of organometallic compounds is necessary, because of their potential toxicities, particularly when they are volatile. Generally such compounds are provided with a detailed outline for their safe manipulation; these should be read carefully and adhered to closely. If there is any doubt, always assume that the materials are lethal and treat them with utmost care and the safety precautions about the handling of substances should always be followed.

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