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- W1968443152 abstract "The apparent pK of HSO−3 is lowered by the addition of salts (NaCl, NaNO3, Na2SO4) but increased by addition of ethanol, glycerol or polyethylene glycol. Sucrose (0–60 wt%) has little or no effect. The pK of sulphurous acid is similarly affected by salts (NaCl, NaNO3) but only ethanol and polyethylene glycol give rise to a substantial increase in value. The effect of salts can be modelled by the extended Debye-Huckel theory. In the case of the 1:1 electrolytes, graphs of pK versus ionic strength pass through minima; for sulphurous acid the pK in the presence of 3 m NaCl is actually greater than that at zero ionic strength for this reason. The equilibrium constant for the formation of the ion-pair NaSO−3 is estimated to be of the order 6 m−1 and evidence is given for the formation of a weak complex between SO2 and Cl−. The nucleophilic reactivity of sulphur(IV) oxospecies in equilibrium with HSO−3 was assessed kinetically by measuring rates of reaction with malachite green. The data indicate that S2O2−5 ion does not behave as a nucleophile in comparison with the nucleophilicity of SO2−3. The relevance of the results to the use of ‘sulphur dioxide’ as a preservative in concentrated foods and in the presence of humectants is considered." @default.
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- W1968443152 date "1991-01-01" @default.
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- W1968443152 title "The state of sulphur dioxide at high concentration and low water activity" @default.
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- W1968443152 doi "https://doi.org/10.1016/0308-8146(91)90096-7" @default.
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