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EC number: 205-633-8
CAS number: 144-55-8
Sodium bicarbonate is a white odourless solid with relative
density of 2.21 -2.23 at 20 ˚C, which decomposes when heated above 50 ˚C
with the release of CO2, H2O and Na2CO3,
resulting in total decomposition at 270 ˚C. Its solubility in water is
93.4 g/L at 20 ˚C and pH 8.4. In aqueous solution, sodium bicarbonate
undergoes a complete dissociation into the respective ions. Its
solubility in most organic solvents is negligible. The n-octanol/water
partition coefficient is not applicable because the substance is
inorganic. The vapour pressure cannot be determined experimentally
(decomposition when heated) but it is negligible because sodium
bicarbonate is an inorganic solid.
Based on its structure and the lack of chemical groups associated
with explosive and/or oxidizing properties, sodium bicarbonate is
considered to be non-explosive and non-oxidizing. Based on the
experience in manufacture and handling, the substance is known not to
react with water and not to possess pyrophoric properties. In a standard
flammability test, no propagation of combustion occurred, indicating
that sodium bicarbonate is non-flammable.
Particle size distribution measurements have been performed on 3
different samples of sodium bicarbonate. Mass median aerodynamic
diameters were 53, 406 and 563 μm, while the D90 varied from 81 to 551
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