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Water solubility

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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.

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.