CALCIUM SULFITE
- Empirical Formula: CaO3S
- Molecular Weight: 120.14
- MDL number: MFCD00040663
What is CALCIUM SULFITE?
Chemical properties
CaSO3.2H2O, white precipitate, pKsp = 7.9, formed by reaction of soluble calcium salt solution and sodium sulfite solution, or by boiling calcium hydrogen sulfite solution; calcium hydrogen sulfite, Ca(HSO3)2, formed in solution by saturating calcium hydroxide or carbonate suspension with sulfurous acid.
The Uses of CALCIUM SULFITE
A major use of calcium sulfite in the past has been the use of “lime” (Ca(OH)2) in “flue-gas” desulphurization (removal of SO2 gas) at “fossil-fuel” electrical power generating plants. Since calcium sulfite is relatively insoluble in water, it can be removed from the slurry by filtration and converted to gypsum, CaSO4·2H2O. The other usage of calcium sulfite or bisulfite compounds has been in the “wood-pulping” industry.
Preparation
Calcium sulfite can be
prepared by the reaction of sodium sulfite with calcium
chloride:
CaCl2＋ Na2SO3→CaSO3＋ 2NaCl
The dihydrate, CaSO3·2H2O is formed. This salt is
white powder that is soluble in dilute sulfurous acid to
form the bisulfite. It may be dehydrated at 150°C to
form the anhydrous salt. It is used in the sulfite process
for the manufacture of wood pulp.
Properties of CALCIUM SULFITE
| Solubility Product Constant (Ksp) | pKsp: 7.17 |
Safety information for CALCIUM SULFITE
Computed Descriptors for CALCIUM SULFITE
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