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In chemistry, an alkali (/ ˈælkəlaɪ /; from the Arabic word al-qāly, القلوي) is a basic, ionic salt of an alkali metal or an alkaline earth metal. An alkali can also be defined as a base that dissolves in water. A solution of a soluble base has a pH greater than 7.0.
Alkali, any of the soluble hydroxides of the alkali metals—i.e., lithium, sodium, potassium, rubidium, and cesium. Alkalies are strong bases that turn litmus paper from red to blue; they react with acids to yield neutral salts; and they are caustic and in concentrated form are corrosive to organic.
alkali. noun. al· ka· li ˈal-kə-ˌlī. plural alkalies or alkalis. 1. : a soluble salt obtained from the ashes of plants and consisting largely of potassium or sodium carbonate. broadly : a substance (such as a hydroxide or carbonate of an alkali metal) having marked basic properties compare base sense 6a. 2. : alkali metal. 3.
The alkali metals are all shiny, soft, highly reactive metals at standard temperature and pressure and readily lose their outermost electron to form cations with charge +1.
Alkali metal, any of the six elements of Group 1 (Ia) of the periodic table—lithium, sodium, potassium, rubidium, cesium, and francium. The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids).
An alkali is where a base is dissolved in water. Often it is the salt of an Alkali metal. An alkali is the opposite to an acid and can be neutralised (brought down to pH 7) by adding acid.
Alkali is a basic soluble hydroxide of alkali metals or alkaline earth metals. The base is a chemical compound that reacts with acids to produce salts. Solubility. Alkalis dissolve in water to produce OH-. Bases do not dissolve in water. Relation.
The alkali metals group is part of the S-block of elements in the periodic table, that along with hydrogen, helium, calcium and others, have their outermost electron in an S-orbital. The alkali metals are soft metals that are highly reactive with water and oxygen. They're so soft that you can cut them with a plastic knife.
alkali (ăl´kəlī) [Arab., al-gili=ashes of saltwort], hydroxide [1] of an alkali metal [2]. Alkalies are readily soluble in water and form strongly basic solutions with a characteristic acrid taste. They neutralize acids, forming salts and water.
Many of the physical properties of the alkali metals (Table 3.1.3 3.1. 3.4) are typical of metals, e.g., thermal and electrical conductivity. However, due to the relatively weak inter-atomic forces (weak M-M bonding) they are soft and readily cut with a knife. Element.