Registration Dossier
Registration Dossier
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EC number: 200-848-3 | CAS number: 75-20-7
Water solubility
Administrative data
Link to relevant study record(s)
- Endpoint:
- water solubility
- Data waiving:
- study scientifically not necessary / other information available
- Justification for data waiving:
- the study does not need to be conducted because the substance is hydrolytically unstable at pH 4, 7 and 9 (half-life less than 12 hours)
- Endpoint:
- water solubility
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- As calcium carbide instantly hydrolyses to Ca(OH)2 and C2H2 upon contact with water/moisture the assessment is based on the degradation products. For details please refer to the read across report in section 13.
- Reason / purpose for cross-reference:
- read-across source
- Key result
- Water solubility:
- 1 200 mg/L
- Conc. based on:
- test mat.
- Temp.:
- 20 °C
- pH:
- 7
- Conclusions:
- The substance Calcium carbide instantly hydrolyses to the decomposition products Ca(OH)2 and C2H2. Therefore, the assessment is based on these decomposition products. Interpretation of results: soluble (1000-10000 mg/L)
The solubility of acetylene in water is 1200 mg/L at 20 °C and pH 7. - Executive summary:
The substance Calcium carbide instantly hydrolyses to the decomposition products Ca(OH)2 and C2H2. Therefore, the assessment is based on these decomposition products. The solubility of acetylene in water as reported in the CRC Handbook of Aqueous Solubility Data is 1200 mg/L at 20 °C and pH 7.
This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the read-across report attached to IUCLID section 13.
- Endpoint:
- water solubility
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- key study
- Justification for type of information:
- As calcium carbide instantly hydrolyses to Ca(OH)2 and C2H2 upon contact with water/moisture the assessment is based on the degradation products. For details please refer to the read across report in section 13.
- Reason / purpose for cross-reference:
- read-across source
- Key result
- Water solubility:
- 1 600 mg/L
- Conc. based on:
- test mat.
- Temp.:
- 20 °C
- Remarks on result:
- other: No information on pH available.
- Conclusions:
- The substance Calcium acetylide instantly hydrolyses to the decomposition products Ca(OH)2 and C2H2. Therefore, the assessment is based on these decomposition products. Interpretation of results: soluble (1000-10000 mg/L)
The water solubility of calcium dihydroxide is 1600 mg/L. - Executive summary:
The substance Calcium acetylide instantly hydrolyses to the decomposition products Ca(OH)2 and C2H2. Therefore, the assessment is based on these decomposition products. The water solubility of calcium dihydroxide as reported in the CRC handbook is 1600 mg/L.
This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the read-across report attached to IUCLID section 13.
Referenceopen allclose all
Description of key information
As calcium carbide instantly hydrolyses to the decomposition products Ca(OH)2 and C2H2, the assessment is based on these decomposition products. The water solubility for Ca(OH)2 and C2H2 is 1600 mg/L at 20 °C and 1200 mg/L at 20 °C and pH 7, respectively.
Key value for chemical safety assessment
- Water solubility:
- 1 200 mg/L
- at the temperature of:
- 20 °C
Additional information
In accordance with column 2 of REACH Annex VII, point 7.7, the water solubility study does not need to be conducted as the substance is hydrolytically unstable (half-life less than 12 hours). The substance instantly hydrolyses in contact with water, yielding the decomposition products Ca(OH)2 and C2H2. Therefore, the assessment is based on these decomposition products and the respective values of water solubility for Ca(OH)2 and C2H2 are reported in this section.
The water solubility for Ca(OH)2 and C2H2 is 1600 mg/L at 20 °C and 1200 mg/L at 20 °C and pH 7, respectively.
The water solubility of acetylene is chosen as the key value in the chemical safety assessment (environment) since calcium hydroxide is considered to be of no environmental concern (neutralisation in buffered environmental media, calcium being a ubiquitous and essential mineral element).
This information is used in a read-across approach in the assessment of the target substance. For justification of read-across please refer to the read-across report attached to IUCLID section 13.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
