Thus this process produces almost no waste chmb31h3

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Unformatted text preview: NaHCO3 formed in the main process is insoluble and easily removed; treatment of remaining solution with CaO (or Ca(OH)2) from CO2 preparation liberates NH3 which is reused, also CO2 formed from calcination of NaHCO3 is reused. • Thus, this process produces almost no waste! CHMB31H3 The Chemistry of Group 1 17 Complexes – General remarks • Several concepts important for chemistry of complexes or coordination compounds: – Complexes (coordination compounds) contain a central atom (or ion) coordinated by one or more molecules or ions (ligands) – Ligands donate an electron pair through a donor atom thus they behave as Lewis bases – Central atom or ion accepts this pair and is behaving like Lewis acid – This type of bond is usually referred to as coordinate bond – The true kings of coordination chemistry (or complex chemistry) are dand f- block metals – Some examples of complexes you have seen before: [Fe(H2O)6]2+, H3B.NMe3, [Co(NH3)6]2+… CHMB31H3 The Chemistry of Group 1 18 Alkali metal complexes • Limited mostly to the crown ethers and cryptand ligands Most common crown ethers O O O O 12-crown-4 O O O 18-crown-6 15-crown-5 O O O O O O O O Crown ether names. 12-crown-4: The first number (12) tells us how many atoms in total are in the crown (ring...
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