Benzenesulfonic acid, 4-C10-13-sec-alkyl derivs., compds. with triethanolamine

Dissociation constant

Link to relevant study record(s)

Reference

Endpoint:

dissociation constant

Type of information:

experimental study

Adequacy of study:

key study

Study period:

06/06/2017

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 112 (Dissociation Constants in Water)

GLP compliance:

no

Specific details on test material used for the study:

Trade name: Marlopon AT 50
Lot No.: 983
Reference No.: 0648 11 00500

Dissociating properties:

yes

No.:

#1

pKa:

2.19

Temp.:

20 °C

	Salt concentration of solution (g/l)	Molarity of solution (mole/l)	Molar conductivity (µS/cm/mole)	Degree of dissociation (α)	Dissociation constant
Solution 5	3.4159	0.00725	44258	0.65	0.0085
Solution 6	1.7080	0.00363	49551	0.72	0.0068
Solution 7	0.8540	0.00181	56724	0.83	0.0072
Solution 8	0.4270	0.00091	60736	0.89	0.0062
Solution 9	0.2135	0.00045	61711	0.90	0.0036

Average dissociaiton constant = 0.0065

Standard deviation of dissociation constant = 0.0018

pK_c = 2.19

Conclusions:

The dissociaiton constant is 2.19.

Executive summary:

In an OECD guideline study (OECD 112), the dissociation of Marlopon AT 50 has been investigated. The dissociation constant is found to be 2.19.

Description of key information

In a OECD guideline study (OECD 112) the dissociation constant has been measured. The pKa is 2.19.

Key value for chemical safety assessment

pKa at 20°C:

2.19