Abstract
The composition of the complex formed by mannitol and borate was investigated by several methods. Linear relationships found between the H + and mannitol concentrations (H 3BO 3 constant) and between pH and log [ H 3 BO 3] 1 2 [ mannitol] for wide ranges of reactant concentrations indicate that H 3BO 3 and mannitol combine only in a 1:1 ratio and that H 3BO 3 is present in dilute solutions principally as a dimer. Titration data also suggest a complex having 1 mannitol/B. In aqueous sodium borate the quantities of mannitol required to maintain a prescribed pH as the solution volume is varied give the relationship expected for dimeric borate ion and a 1:1 combining ratio. The heat of complex formation also indicates a 1:1 ratio. The major complexing reaction thus appears to be the splitting of a borate dimer and the formation of 2 moles of a 1:1 complex. A complex with the widely accepted borospirane (di-diol) structure is not present in aqueous solutions.
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