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Physical & Chemical properties

Water solubility

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Reference
Endpoint:
water solubility
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010-03-23 to 2010-04-30
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP guideline study
Reason / purpose for cross-reference:
reference to same study
Qualifier:
according to guideline
Guideline:
EU Method A.6 (Water Solubility)
Version / remarks:
, 2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Remarks:
signed 2009-11-26
Type of method:
flask method
Water solubility:
956 mg/L
Temp.:
20 °C
pH:
12.3
Remarks on result:
other: This is the water solubility of calcium. The temperature was ± 0.5 °C.
Water solubility:
1 337.6 mg/L
Temp.:
20 °C
pH:
12.3
Remarks on result:
other: The water solubility of CaO was not stated in the study report. Therefore the value was recalculated from the water solubility value of calcium as stated in the study report.
Details on results:
No further relevant information was stated.
Conclusions:
Interpretation of results (migrated information): soluble (1000-10000 mg/L)
The water solubility of the test item and /or degradation products has been determined to be 956 mg calcium/l of solution at 20.0 ± 0.5 °C (recalculated value for calcium oxide: 1337.6 mg/l).
Executive summary:

The water solubility of calcium oxide was tested by measuring the concentration calcium ions in saturated solution. The solubility of calcium oxide was recalculated from the water solubility value of calcium, which was stated in the study report.

Description of key information

Water solubility of calcium oxide: soluble (study results, EU A.6 method)

Key value for chemical safety assessment

Water solubility:
1 337.6 mg/L
at the temperature of:
20 °C

Additional information

pH of the saturated solution: 12.3. For the evaluation of this endpoint, data from one guideline compliant study (EU A.6 method) was used as key information. The value for the water solubility of calcium oxide was recalculated from the solubility value of calcium, which was stated in the study report. It is standard textbook knowledge that calcium oxide reacts to calcium hydroxide in contact with water. The water solubility of calcium carbonate, as determined in a study performed according to OECD TG 105, is 16.6 mg/L at 20 °C.