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Physical & Chemical properties

Water solubility

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Description of key information

The HYDROTOPES Category comprises the following 6 substances:
STS - Sodium toluene 4-sulphonate (CAS 657-84-1, EC 211-522-5)
SXS - Sodium (xylenes and 4-ethylbenzene) sulphonate (EC 701-037-1)
NH4XS - Ammonium (xylenes and 4-ethylbenzene) sulphonate (EC 943-024-5)
SCS - Sodium p-cumenesulphonate (CAS 15763-76-5, EC 239-854-6)
KCS - Potassium p-cumenesulphonate (CAS 164524-02-1, EC 629-764-9)
NH4CS - Ammonium p-cumenesulphonate (CAS 680972-33-2, EC 811-484-5) 


All the category members were tested for water solubility and the values are:


STS = 818 g/l (20 °C, pH 9.6)
SXS =664 g/l (20 °C, pH 11.96)
NH4XS = 576 g/l (20 °C, pH 8.83 -8.94)
SCS = 493 g/l (23 °C, pH 6 -7)


KCS = 499 g/l (20 °C, pH 6 -7)
NH4CS > 1000 (20 °C, pH 6 -8)


 


All the substances have high water solubility, all the values are in the same range.

Key value for chemical safety assessment

Water solubility:
493 g/L
at the temperature of:
20 °C

Additional information

The lowest value was selected for the risk assessment.