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Dissociation constant

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Reference
Endpoint:
dissociation constant
Type of information:
experimental study
Adequacy of study:
key study
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:
not specified
Specific details on test material used for the study:
- Name of test material (as cited in study report): Aerophine 3418A Promoter, stripped
- IUPAC nomenclature - Sodium diisobutyldithiophosphinate
- Lot WEA102051
- Appearance - White powder with lumps
- CAS No. 13360-78-6
- Molecular Formula - C8H18PS2.Na
- Molecular Weight - 232 g/mole
- Purity > 99%
Dissociating properties:
yes
No.:
#1
pKa:
7.1
Temp.:
20 °C
No.:
#2
pKa:
8
Temp.:
20 °C

Run No.

endpoint 1

pKa1

endpoint 1

pKa2

sample

weight (g)

1

7.374

7.129

9.000

8.109

9.366

2

7.247

6.996

8.892

8.007

6.070

3

7.172

7.042

9.038

7.990

13.281

Avg. and S.D.à

7.264±0.102

7.056± 0.068

8.977± 0.076

8.035± 0.064

 

Conclusions:
The test substance has two pKa’s (dissociation constants); 7.1 and 8.0.
Executive summary:

The test substance has two pKa’s (dissociation constants); 7.1 and 8.0. The pKawas determined using an automated titration method. 

Description of key information

The test substance has two pKa’s (dissociation constants); 7.1 and 8.0.

Key value for chemical safety assessment

pKa at 20°C:
7.1

Additional information

Determined using an automated titration method.