The blue solutions decompose over time and loose

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Unformatted text preview: ) NH4+ + NH2- K = [NH4+][NH2-] = 5.1.10-27 mol2/dm6 • Liquid NH3 dissolves alkali metals producing deep blue solutions: M (s) Liquid NH3 M+ (sol) + e- (sol) Metastable blue solutions • These solutions are excellent reducing agents. • The blue solutions decompose over time and loose colour (the free electrons reduce ammonia on standing): 2NH3 (l) +2e- (sol) CHMB31H3 2 NH2- (sol) + H2 The Chemistry of Group 1 Under kinetic control give metal amides, MNH2, very useful strong bases. 22 Alkalides and Electrides • Alkalides are alkali metal anions (M-) with an ns2 electronic configuration (known for all but Li) • If 0.5 equivalents of crypt-222 is added to a Na solution in CH3CH2NH2 a golden yellow complex [Na(crypt-222)]Na containing Na- anion, can be isolated. • If 1 equivalent of crypt is used, or 2 equivalents of a crown ether electrides can be isolated – these contain a free electron in their structure, i.e. [M(crypt-222)]+e-. [Na(crypt-222)]Na structure CHMB31H3 [Cs(18-crown-6)2]e structure The Chemistry of Group 1 23 Overview • • • • Occurrence and isolation; Nuclear properties; Chemical and physical properties; Reactivity: – – – – • • • • CHMB31H3 With water; With H2 (stability of hydrides); With X2 (with halogens; stability of halides); With O2 (different oxides; reactivi...
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This note was uploaded on 05/30/2012 for the course CHEM 101 taught by Professor Zoom during the Spring '12 term at Beirut Arab University.

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