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EC number: 203-180-0
CAS number: 104-15-4
The dissociation constants for the 5 aromatic sulphonic acids range from 2.5 to 3.17 at 20 °C.
The ASA Category comprises 5 aromatic sulphonic acids and the dissociation constant are:
TSA, Toluene-4-sulphonic acid (EC 203-180-0, CAS 104-15-4): 2.96
XSA, (Xylenes and 4-ethylbenzene) sulphonic acid (EC 701-247-3, CAS -) Former EC 246-839-8: 2.88
CSA, p-cumene sulphonic acid (EC 240-210-1, CAS 16066-35-6): 3.17
BSA, Benzene sulphonic acid (EC 202-638-7, CAS 98-11-3): 2.68
HBSA, 4-hydroxybenzensulphonic acid (EC No. 202-691-6, CAS No. 98-67-9): 2.5
The lowest value has been selected as key value for the Chemical Safety Assessment
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