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2 Structure and properties. ... This page provides supplementary chemical data on calcium hydroxide. ... pH (at 20 °C) 12.4-12.6 [3]
Calcium hydroxide adopts a polymeric structure, as do all metal hydroxides. The structure is identical to that of Mg(OH) 2 (brucite structure); i.e., the cadmium iodide motif. Strong hydrogen bonds exist between the layers. [10] Calcium hydroxide is produced commercially by treating (slaking) quicklime with water: CaO + H 2 O → Ca(OH) 2
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Calcium hydroxide has a high enough pH to turn the phenolphthalein a vivid purplish-pink color, thus indicating the presence of water. Chemical pulping: Calcium oxide is used to make calcium hydroxide, which is used to regenerate sodium hydroxide from sodium carbonate in the chemical recovery at kraft pulp mills.
Portlandite is a hydroxide-bearing mineral typically included in the oxide mineral class. It is the naturally occurring form of calcium hydroxide (Ca(OH) 2) and the calcium analogue of brucite (Mg(OH) 2).
DIMBA reacts further with formaldehyde to give trimethylolpropane and calcium formate. Calcium formate is separated from the solution, heat treated to remove formaldehyde and then dried. [5] Calcium formate can also be made from calcium hydroxide and carbon monoxide at high pressure and temperature [2] – e.g., at 180 °C and 35 atm. [10]
Calcium hydroxide (slaked lime) is used in the manufacture of bleaching powder. Calcium hydroxide is also used to clean the sulfur dioxide, which is caused by the exhaust, that is found in power plants and factories. [9] Magnesium hydroxide is used as an 'antacid' to neutralize excess acid in the stomach and cure indigestion.
For example, copper immobilization at high pH can be achieved through the formation of C-S-H/C-A-H and ettringite. [16] The crystal structure of ettringite Ca 6 Al 2 (SO 4) 3 (OH) 12 ·26H 2 O can incorporate a variety of divalent ions: Cu 2+, Pb 2+, Cd 2+ and Zn 2+, which can substitute for Ca 2+. [16]