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Its solubility product K sp of 5.02 × 10 −6 at 25 °C, [1] its dissociation in water is large enough that its solutions are basic according to the following dissolution reaction: Ca(OH) 2 → Ca 2+ + 2 OH −. The solubility is affected by the common-ion effect. Its solubility drastically decreases upon addition of hydroxide or calcium sources.
In chemistry, a strong electrolyte is a solute that completely, or almost completely, ionizes or dissociates in a solution. These ions are good conductors of electric current in the solution. Originally, a "strong electrolyte" was defined as a chemical compound that, when in aqueous solution, is a good conductor of electricity. With a greater ...
By rewriting the last reaction in the inverse direction one obtains a reaction consistent with what is observed in the lime sulfur global reaction: 3 / 8 S 8 + 2 H 2 O → 2 H 2 S + SO 2. In alkaline conditions, it gives: 3 / 8 S 8 + 2 H 2 O + 6 OH − → 2 S 2− + SO 2− 3 + 5 H 2 O. and after simplification, or more exactly recycling, of ...
When this reaction occurs in an aqueous solution, gyspum results. The rate of this reaction can be increased in the presence of magnesium(II) sulfate as a catalyst. [4] Other catalysts for the oxidation of calcium bisulfite include manganese, iron, cobalt, nickel, lead, and zinc. [2]
The structure is related to that of zirconium orthosilicate (zircon): Ca 2+ is 8-coordinate, SO 2− 4 is tetrahedral, O is 3-coordinate. CaSO 4 ·2H 2 O (gypsum and selenite (mineral)): dihydrate. [7] CaSO 4 · 1 / 2 H 2 O : hemihydrate, also known as plaster of Paris. Specific hemihydrates are sometimes distinguished: α-hemihydrate ...
Calcium sulfite, or calcium sulphite, is a chemical compound, the calcium salt of sulfite with the formula CaSO 3 ·x(H 2 O). Two crystalline forms are known, the hemihydrate and the tetrahydrate, respectively CaSO 3 ·½(H 2 O) and CaSO 3 ·4(H 2 O). [2] All forms are white solids. It is most notable as the product of flue-gas desulfurization.
In chemical terms, the pozzolanic reaction occurs between calcium hydroxide, also known as portlandite (Ca(OH) 2), and silicic acid (written as H 4 SiO 4, or Si(OH) 4, in the geochemical notation): Ca(OH) 2 + H 4 SiO 4 → CaH 2 SiO 4 ·2 H 2 O. or summarized in abbreviated cement chemist notation: CH + SH → C-S-H. The pozzolanic reaction can ...
CaSO 4 + 2 C → CaS + 2 CO 2. and can react further: 3 CaSO 4 + CaS → 4 CaO + 4 SO 2. In the second reaction the sulfate (+6 oxidation state) oxidizes the sulfide (-2 oxidation state) to sulfur dioxide (+4 oxidation state), while it is being reduced to sulfur dioxide itself (+4 oxidation state).