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Calcium hydroxide is modestly soluble in water, as seen for many dihydroxides. Its solubility increases from 0.66 g/L at 100 °C to 1.89 g/L at 0 °C. [8] 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:
That is, in grams, the atomic weight of the element divided by the usual valence. [2] For example, the equivalent weight of oxygen is 16.0/2 = 8.0 grams. For acid–base reactions, the equivalent weight of an acid or base is the mass which supplies or reacts with one mole of hydrogen cations (H +).
The gram-atom is a former term for a mole of atoms, and gram-molecule for a mole of molecules. [7] Molecular weight (M.W.) (for molecular compounds) and formula weight (F.W.) (for non-molecular compounds), are older terms for what is now more correctly called the relative molar mass (M r). [8]
Cd(NO 3) 2 + 2 NaOH → Cd(OH) 2 + 2 NaNO 3. Preparation has been achieved from some other cadmium salts, [7] [5] Cd(OH) 2 and cadmium oxide react equivalently. Cadmium hydroxide is more basic than zinc hydroxide. It forms the anionic complex [Cd(OH) 4] 2− when treated with concentrated base. It forms complexes with cyanide, thiocyanate, and ...
Actual formula Name or mineral phase CH: Ca(OH) 2 or CaO · H 2 O: Calcium hydroxide (portlandite) C-S-H: 0.6–2.0 CaO · SiO 2 · 0.9–2.5 H 2 O, with variable composition within this range, and often also incorporating partial substitution of Al for Si: Calcium silicate hydrate: C-A-H: Phase more complex than C-S-H: Calcium aluminate ...
The reaction of CaH 2 with water can be represented as follows: CaH 2 + 2 H 2 O → Ca(OH) 2 + 2 H 2. The two hydrolysis products, gaseous H 2 and Ca(OH) 2, are readily separated from the dried solvent. Calcium hydride is a relatively mild desiccant and, compared to molecular sieves, probably inefficient. [7]
Magnesium hydroxide is an inorganic compound with the chemical formula Mg(OH) 2. ... Use of Ca(OH) 2 can yield CaSO 4 ... magnesium hydroxide is dosed at 5–10 grams ...
Calcium bisulfite can be prepared by treating lime (chemical formula Ca(OH) 2) with an excess of sulfur dioxide and water. [2] Upon synthesis of calcium bisulfite solution, it will have a green to yellow opaque appearance as an aqueous solution. [3]