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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:
The tables below provides information on the variation of solubility of different substances (mostly inorganic compounds) in water with temperature, at one atmosphere pressure. Units of solubility are given in grams of substance per 100 millilitres of water (g/(100 mL)), unless shown otherwise.
Calcium hydroxide (data page) 1 language. ... Solubility in H 2 O 0.160 20 g/100 g [2] pH (at 20 °C) 12.4-12.6 [3] Thermodynamic properties. Phase behavior
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
pK sp; Aluminium hydroxide: 14.43 Ammonium magnesium phosphate: 12.60 Barium carbonate: 8.09 Barium chromate: 9.62 (28 °C) Barium fluoride: 5.76 (25.8 °C) Barium iodate
This is also the case for calcium hydroxide (portlandite), whose solubility at 70 °C is about half of its value at 25 °C. The dissolution of calcium hydroxide in water is also an exothermic process (ΔH < 0). As dictated by the van 't Hoff equation and Le Chatelier's principle, lowe temperatures favorsf dissolution of Ca(OH) 2. Portlandite ...