Aqueous solution chemistry and macrocyclic complexes

The solid state structures of NaHC03 and KHCO3 exhibit hydrogen bonding (see Section 10.6). In KHCO3, the anions associate in pairs (Fig. 11.7a) whereas in NaHC03, infinite chains are present (Fig. 11.7b). In each case, the hydrogen bonds are asymmetrical. 

Sodium silicates are of great commercial importance and are discussed in Sections 14.2 and 14.9. 

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