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Dilute aqueous solutions of the calcium and sodium salts of “α”-d-isosaccharinate (ISA) have been analyzed by 13C and 1H NMR spectroscopy. The positions of the six 13C ISA NMR lines show a pH dependence that can be used to infer that the most acidic proton is the one associated with the carboxylate group, with an aver- age log k0 of −3.27 for the reaction H(ISA) ⇌ H+ + ISA− in solutions made with...
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