Registration Dossier

Physical & Chemical properties

Dissociation constant

Currently viewing:

Administrative data

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:
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

pKc = 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

Additional information