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Measured solubility of sodium 4-nitrobenzenesulphonate in aqueous solutions of sodium chloride, sodium sulfate and ethanol are presented in Tables 1, 2 and 3, respectively. The corresponding solubility curves are shown in Figures 1, 2 and 3. Because the polarity of drug is closer to the first, the solubility of sodium 4-nitrobenzenesulphonate in water is higher than that in sodium chloride, sodium sulfate or ethanol aqueous solutions.
Figures 1 to 3 further illustrate that the solubility of sodium 4-nitrobenzenesulphonate in sodium chloride + water is lower than that in ethanol + water solvent mixtures or sodium sulfate + water mixture at the same conditions. Sodium chloride + water mixture is the best solvent mixture for purifying sodium 4-nitrobenzenesulphonate.
The relationship between temperature and solubility of sodium 4-nitrobenzenesulphonate is correlated by a modified Apelblat equation,

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