Abstract
The pH titration curves of monoclinic antimonic acid (M-SbA) showed apparently monobasic acid for the systems of alkali metal ions/H+. The uptake order of the metal ions were K+ < Rb+ < Cs+ < Na+ < Li+ throughout the pH range studied. The low uptakes of K+, Rb+, Na+ and Cs+ at high pH might be due to steric or ion sieve effects for large unhydrated cations on M-SbA. Thermodynamic data were derived for Li+/H+ exchange on M-SbA from pH titration curve.

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