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EC number: 943-024-5
CAS number: -
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 except STS were tested and the pKa values are: SXS: pKa = 7.10NH4XS pKa = 7.78 SCS: pKa < 2 (The dissociation constant was estimated on the free non-neutralised cumenesulfonic acid. The degree of dissociation at relevant pH values (5-9) is equal or larger than 99.9 %.)KCS: pka < 2 (The dissociation constant was estimated on the free non-neutralised cumenesulfonic acid. The degree of dissociation at relevant pH values (5-9) is equal or larger than 99.9 %.)NH4CS: pKa = 6.59
All the category members are sodium, potassium and ammoniun salt. When dissolved in water, hydrotropes are completely ionised.
The lowest value of the dissociation constant of Hydrotropes was selected for the risk assessment.
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