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EC number: 238-484-2 | CAS number: 14484-64-1
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Dissociation constant
Administrative data
Link to relevant study record(s)
- Endpoint:
- dissociation constant
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 1999-05-20 - 1999-05-20
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 112 (Dissociation Constants in Water)
- Version / remarks:
- 1981
- Deviations:
- no
- GLP compliance:
- yes
- Dissociating properties:
- no
- Conclusions:
- The methodological procedures using the reference substance ammonium acetate, results pKa values consistent with those found in the literature.
It was not possible to determine the dissociation constant of test substance in water, because there were not equivalent points when titration with HCl or NaOH solutions. - Executive summary:
The dissociation constant of the test substance Ferbam was analyzed according to OECD Guideline 112 (Dissociation Constants in Water), through titration methodology by measuring the direct pH in the aqueous solution at 20°C. A solution of ammonium acetate was used as reference substance. According to the results, it was not possible to determine the dissociation constant of test substance in water, because there were not equivalent points when titrating with HCl or NaOH solutions.
Reference
Results the pKa of the ammonium acetate
The equivalent points for the titration by the HCl and NaOH solutions were the following:
chloridric acid 1.0 mol/L = 8.75 mL
sodium hydroxide 1.0 mol/L = 9.30 mL
Starting from the values of the 50% equivalent point, it was observed the following values by titration:
chloridric acid 1.0 mol/L = 4.37 mL pH = 5.11
sodium hydroxide 1.0 mol/L = 4.65 mL pH = 8.98
Using interpolation calculations, it was obtained the correspondents means of pH in function of the determines volume above and, consequently the refereed pKa. The results obtained for the references substances are shown here:
Reference substanc | pKa experimental 20 °C | pKa literature |
Acetic acid | 5.11 | 4.75 |
Ammonium | 8.98 | 9.26 |
Test substance
The Table below presents the used values for the determinations of titration curves Ferbam, by means of titration with NaOH 1.0 mol/L and HCl 1.0 mol/L.
Table Values pH of Ferbam in function of the addition of NaOH 1.0 mol/L and HCl 1.0 mol/L.
Volume | pH | Potential | Variation | Volume | pH | Potential | Variation |
of NaOH | solution | (mV) | of | of HCl | solution | (mV) | of |
1.0 mol/L (mL) | potential (mV) | 1.0 mol/L (mL) | potential (mV) | ||||
- | 5,60 | 240 | - | - | 5,88 | 260 | - |
0,25 | 10,31 | 016 | 224 | 0,25 | 3,48 | 250 | 010 |
0,50 | 10,64 | 012 | 004 | 0,50 | 3,18 | 242 | 008 |
0,75 | 10,83 | 007 | 005 | 0,75 | 3,00 | 231 | 011 |
1,00 | 10,96 | 001 | 006 | 1,00 | 2,88 | 218 | 013 |
1,25 | 11,06 | -005 | -004 | 1.25 | 2,78 | 216 | 002 |
1,50 | 11,14 | -011 | 016 | 1,50 | 2,70 | 216 | 000 |
1,75 | 11,19 | -017 | 028 | 1,75 | 2,64 | 216 | 000 |
2,00 | 11,26 | -022 | 039 | 2,00 | 2,58 | 217 | -001 |
2,25 | 11,31 | -027 | 049 | 2,25 | 2,53 | 218 | -001 |
2,50 | 11,35 | -032 | 059 | 2,50 | 2,49 | 219 | -001 |
2,75 | 11,39 | -038 | 070 | 2,75 | 2,44 | 220 | -001 |
3,00 | 11,42 | -042 | 080 | 3,00 | 2,41 | 221 | -001 |
3,25 | 11,46 | -046 | 088 | 3,25 | 2,37 | 223 | -002 |
3,50 | 11,49 | -050 | 096 | 3,50 | 2,34 | 224 | -001 |
3,75 | 11,53 | -054 | 104 | 3,75 | 2,31 | 225 | -001 |
pKa results of the substance
It was not possible to determine the dissociation constant of test substance in water, because there were not equivalent points when titration with HCl or NaOH solutions.
Description of key information
The dissociation constant of the test substance Ferbam was analyzed according to OECD Guideline 112 (Dissociation Constants in Water) It was not possible to determine the dissociation constant of test substance in water, because there were not equivalent points when titrating with HCl or NaOH solutions.
Key value for chemical safety assessment
Additional information
Key: Pessin, 1999
The dissociation constant of the test substance Ferbam was analyzed according to OECD Guideline 112 (Dissociation Constants in Water), through titration methodology by measuring the direct pH in the aqueous solution at 20°C. A solution of ammonium acetate was used as reference substance. According to the results, it was not possible to determine the dissociation constant of test substance in water, because there were not equivalent points when titrating with HCl or NaOH solutions.
Other information: Vandegans, 1987
The study was equivalent or similar to OECD guideline n°108, Ed. 1981. For the various reasons mentioned, we consider that the determination of the stability constant of FERBAM is pointless and, especially for electrochemical reasons, impossible if the OECD prescriptions are to be followed.
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