Search results
Results from the WOW.Com Content Network
Calcium hydroxide is moderately 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 pozzolanic activity is a measure for the degree of reaction over time or the reaction rate between a pozzolan and Ca 2+ or calcium hydroxide (Ca(OH) 2) in the presence of water. The rate of the pozzolanic reaction is dependent on the intrinsic characteristics of the pozzolan such as the specific surface area , the chemical composition and ...
Std entropy change of fusion, Δ fus S o? J/(mol·K) Std enthalpy change of vaporization, Δ vap H o? kJ/mol Std entropy change of vaporization, Δ vap S o? J/(mol·K) Solid properties Std enthalpy change of formation, Δ f H o solid-985.2 kJ/mol [4] Standard molar entropy, S o solid: 83.4 J/(mol K) [4] Heat capacity, c p: 87.5 J/(mol K) [4 ...
For many substances, the formation reaction may be considered as the sum of a number of simpler reactions, either real or fictitious. The enthalpy of reaction can then be analyzed by applying Hess' law, which states that the sum of the enthalpy changes for a number of individual reaction steps equals the enthalpy change of the overall reaction.
Calcium oxide (formula: Ca O), commonly known as quicklime or burnt lime, is a widely used chemical compound. It is a white, caustic , alkaline , crystalline solid at room temperature . The broadly used term lime connotes calcium-containing inorganic compounds , in which carbonates , oxides , and hydroxides of calcium, silicon , magnesium ...
The standard Gibbs free energy of formation (G f °) of a compound is the change of Gibbs free energy that accompanies the formation of 1 mole of a substance in its standard state from its constituent elements in their standard states (the most stable form of the element at 1 bar of pressure and the specified temperature, usually 298.15 K or 25 °C).
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]
It consists of calcium cations (Ca 2+) and chloride (Cl −) and hydroxide (− OH) anions. A white solid, it forms by the reaction of hydrogen chloride with calcium hydroxide [3] According to X-ray crystallography, it adopts a layered structure related to brucite (magnesium hydroxide, Mg(OH) 2). [4]