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Sodium is a chemical element; it has symbol Na (from Neo-Latin natrium) and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable isotope is 23 Na. The free metal does not occur in nature and must be prepared from compounds.
Borax (also referred to as sodium borate, tincal (/ ˈ t ɪ ŋ k əl /) and tincar (/ ˈ t ɪ ŋ k ər /)) is a salt (ionic compound), a hydrated or anhydrous borate of sodium, with the chemical formula Na 2 H 20 B 4 O 17 (also written as Na 2 B 4 O 7 ·10H 2 O). It is a colorless crystalline solid that dissolves in water to make a basic solution.
Physical properties. Pure sodium hydroxide is a colorless crystalline solid that melts at 318 °C (604 °F) without decomposition and boils at 1,388 °C (2,530 °F). It is highly soluble in water, with a lower solubility in polar solvents such as ethanol and methanol. [14] Sodium hydroxide is insoluble in ether and other non-polar solvents.
CN− + −OCl → OCN− + Cl−. Sodium hypochlorite is commonly used as a biocide in industrial applications to control slime and bacteria formation in water systems used at power plants, pulp and paper mills, etc., in solutions typically of 10–15% by weight.
In industry, the various grades of sodium silicate are characterized by their SiO 2 :Na 2 O weight ratio (which can be converted to molar ratio by multiplication with 1.032). The ratio can vary between 1:2 and 3.75:1. [1] Grades with ratio below 2.85:1 are termed alkaline. Those with a higher SiO 2 :Na 2 O ratio are described as neutral.
The formula Na 2 SO 3 denotes that the cation is sodium, or Na +, and that the anion is the sulfite ion (SO 2− 3). Therefore, this compound is named sodium sulfite. If the given formula is Ca(OH) 2, it can be seen that OH − is the hydroxide ion. Since the charge on the calcium ion is 2+, it makes sense there must be two OH − ions to ...
Valley Forge, Pennsylvania, U.S. 40°05′49″N 75°26′21″W. / 40.096944°N 75.439167°W / 40.096944; -75.439167. Valley Forge was the winter encampment of the Continental Army, under the command of George Washington, during the American Revolutionary War. The Valley Forge encampment lasted six months, from December 19, 1777 to ...
Washington's Headquarters at Valley Forge, also known as the Isaac Potts House, is a historic house that served as General George Washington 's headquarters at Valley Forge during the American Revolutionary War. The building, which still stands, is one of the centerpieces of Valley Forge National Historical Park in Southeastern Pennsylvania .