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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
– 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 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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