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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Dissociation constant

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
dissociation constant
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Reason / purpose for cross-reference:
read-across source
Dissociating properties:
yes
No.:
#1
pKa:
-7.7
Temp.:
22 °C
Remarks on result:
other: calculated from alpah-naphtoic sulfonic acid group
No.:
#2
pKa:
-7.2
Temp.:
22 °C
Remarks on result:
other: calculated from beta-naphthoic sulfonic acid group
No.:
#3
pKa:
-5.6
Temp.:
22 °C
Remarks on result:
other: calculated from Triazin
No.:
#4
pKa:
0.42
Temp.:
22 °C
Remarks on result:
other: calculated from secondary amine, 2x
No.:
#5
pKa:
0
Temp.:
22 °C
Remarks on result:
other: calculated from protonated diazobenzene, 2x

None

Conclusions:
The molecule is negatively charged and is present in anionic form over the whole environmentally releevant pH range.
Executive summary:

The behaviour of FAT 40821/A in aqueous solutions is domintated by the strongly acidic -SO3H-groups. Therefore, the molecule is negatively charged and is present in anionic form over the whole environmentally releevant pH range.

Description of key information

estimation method

Key value for chemical safety assessment

pKa at 20°C:
1

Additional information

Currently no study regarding dissociation constant is available with FAT 40210. However, the behaviour of FAT 40821/A (structurally similar substance) in aqueous solutions is dominated by the strongly acidic -SO3H-groups. Therefore, the molecule is negatively charged and is present in anionic form over the whole environmentally relevant pH range.