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EC number: 664-492-4 | CAS number: 742087-49-6
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
For the solution that contains 60% of water , 37% Suga Nate 160 and 3% NaCl
Key value for chemical safety assessment
- Vapour pressure:
- 23.76 kPa
- at the temperature of:
- 25 °C
Additional information
The vapor pressure of 100% water at 25 °C is 23.76 mm Hg. For the solution that contains 60% water, 37% Suga®Nate 160, and 3% NaCl the vapor pressure can be calculated from Raoult’s law:
thevapor pressureof anideal solutionis dependent on the vapor pressure of eachchemical componentand themole fractionof the component present in the solution
For Suga®Nate 160, 37 g active Suga®Nate 160(MW 617.8 g/mol) = 0.0599 mol, 3 g NaCl (MW 58.44 g/mol) = 0.0513 mol, while 60 g water (18 g/mol) = 3.333 mol.
The mole fraction of water is thus: 3.333 / (3.333 + 0.0513 + 0.0599) = 96.8%
The partial pressure of water is thus 0.968 * 23.76 = 23.0 mm Hg.
Both Suga®Nate 160 and NaCl are salts, and have no appreciable vapor pressure, so the vapor pressure of the mixture is 23.0 mm Hg.
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