Registration Dossier
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EC number: 250-807-9 | CAS number: 31795-24-1
Henry's Law constant
Administrative data
Link to relevant study record(s)
Description of key information
Henry's Law Constant: Calculated HLC for methylsilanetriol at environmental temperature (12°C): 2.3 x 10-6 Pa m3mol-1
Key value for chemical safety assessment
- Henry's law constant (H) (in Pa m³/mol):
- 0
- at the temperature of:
- 12 °C
Additional information
The transfer of a substance from the water phase to the gas phase can be estimated by means of the Henry’s Law Constant (HLC). No measured value for this parameter is available. The HLC can be estimated from the ratio of the vapour pressure (VP) to the water solubility (WS).
HLC = (VP x MW)/WS
Where MW is molecular weight.
Volatilisation from water is not relevant for the potassium methylsilanetriolate because the substance is a salt that is only stable in aqueous solution at high pH (>12). In solution at pH 9 or below and at low concentration (conditions relevant for the environment), methylsilanetriol will predominate.
The calculated HLC value for methylsilanetriol at environmental temperature (12°C) is very low, 2.3 x 10-6 Pa m3mol-1 (taken from EUSES 2.1.2).
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