![]() ![]() This can lead to the formation of a damp or sticky layer on the surface of the substance.Ĭalcium hydroxide is widely used in various applications:Ĭonstruction: It is used in the production of cement, mortar, and plaster, where it acts as a binder and improves the strength and durability of these materials. Hygroscopicity: Calcium hydroxide has hygroscopic properties, meaning it has a tendency to absorb moisture from the atmosphere. The pH of a saturated calcium hydroxide solution is around 12-13. ![]() PH: When calcium hydroxide dissolves in water, it forms a basic or alkaline solution. This process is known as carbonation and is responsible for the hardening and stabilization of calcium hydroxide in construction materials such as mortar and plaster. Reactivity: Calcium hydroxide reacts readily with carbon dioxide (CO 2 ) in the atmosphere to form calcium carbonate (CaCO 3 ). When dissolved in water, it dissociates to release hydroxide ions, which can react with acids to form salts and water. Melting Point: Calcium hydroxide has a high melting point of around 580 degrees Celsius (1076 degrees Fahrenheit).Ĭhemical properties of Calcium Hydroxide:Īlkalinity: Calcium hydroxide is a strong base and exhibits alkaline properties. However, its solubility increases with temperature.ĭensity: The density of calcium hydroxide is approximately 2.21 grams per cubic centimeter (g/cm³). Solubility: Calcium hydroxide is sparingly soluble in water, meaning it dissolves only to a limited extent. Odor: It has a characteristic odor, which is slightly sweet and alkaline. It can also appear as a colorless or slightly off-white substance. Physical properties of Calcium Hydroxide:Īppearance: Calcium hydroxide is a white, crystalline powder or solid. Each hydroxide ion consists of one oxygen atom bonded to one hydrogen atom. The calcium ion is located at the center, while the hydroxide ions are positioned around it. The molecular structure of calcium hydroxide consists of a calcium cation (Ca 2+ ) surrounded by two hydroxide anions (OH – ). ![]()
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