Lecture8_AlkaliMetals_bandw

These are the strongest bases known with basicity

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Unformatted text preview: other products vary depending on the oxide type: M2O + H2O → 2MOH M2O2 + 2H2O → 2MOH + H2O2 MO2 + 2H2O → 2MOH + H2O2 + O2 • Hydroxides are also produced when aqueous solution of MCl are electrolyzed, from MH and H2O and from M and H2O. • These are the strongest bases known with basicity increasing Li << Na < K < Rb < Cs (any idea why?) • Reaction of peroxides with water is also used for production of H2O2 CHMB31H3 The Chemistry of Group 1 15 Oxides - Overview M Suboxides Oxides Peroxides Superoxides Ozonides N/a Li2O White Li2O2 White LiO2, stable at low temp N/a Na N/a Na2O White Na2O2 (*) White to pale yellow NaO2 Orange, dec. K K2O2 (*) K2 O Yellowish-white Yellow Li N/a NaO3 Dec. Red KO2 Orange KO3 Dec. Dark red Rb6O bronze Rb Rb9O2 red Rb2O Yellow Rb2O2 (*) Yellow RbO2 Orange RbO3 Dark red Cs4O violet Cs7O bronze Cs Cs3O blue Cs11O3 violet Cs2O Orange Cs2O2 (*) Yellow CsO2 Orange CsO3 Dark red (*) colour CHMB31H3 varies from white to yellow depending on the MO2 amount in the sample The Chemistry of Group 1 16 Oxosalts • Many oxosalts (carbonates, sulfates, nitrates…) • Solvay soda synthesis is a very important industrial process: + H2O CaCO3 ~ 1300 K Main process CaO + CO2 2H2O + CO2 preparation NaCl + 2CO2 + 2NH3 + 2H2O Product isolation and CO2 regeneration Ca(OH)2 NH3 regeneration Na2CO3 + CO2 + H2O CaCl2 + 2NaHCO3 + 2NH4Cl ∆ 2NH3 2NaHCO3 ...
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