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In the title salt, Na+·C7H7ClNO2S−·1.5H2O, one of the water molecules lies on a twofold axis. The sodium ion shows an O6 octahedral coordination defined by three water O atoms and three sulfonyl O atoms derived from three different anions. The S—N distance of 1.5898 (19) Å is consistent with an S=N double bond. The crystal structure is stabilized by N—H...O and O—H...Cl hydrogen bonds.