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A strong base is a basic chemical compound that can remove a proton (H +) from (or deprotonate) a molecule of even a very weak acid (such as water) in an acid–base reaction. Common examples of strong bases include hydroxides of alkali metals and alkaline earth metals, like NaOH and Ca(OH)
A Lewis base is also a Brønsted–Lowry base, but a Lewis acid does not need to be a Brønsted–Lowry acid. The classification into hard and soft acids and bases ( HSAB theory ) followed in 1963. The strength of Lewis acid-base interactions, as measured by the standard enthalpy of formation of an adduct can be predicted by the Drago–Wayland ...
Base, or foundation (cosmetics), a cosmetic applied to the face; Base (heraldry), the lower part of the shield in heraldry; Base, or pedestal, a supporting feature of a statue or other item; Cooking base, a concentrated flavouring compound; Military base, or non-military base camp, a bivouac which provides shelter, military equipment and personnel
BASE jump in Oman, 2013 BASE jumping from Sapphire Tower, Istanbul BASE jumping ( / b eɪ s / ) is the recreational sport of jumping from fixed objects, using a parachute to descend to the ground. BASE is an acronym that stands for four categories of fixed objects from which one can jump: buildings , antennas (referring to radio masts ), spans ...
Marx's "base determines superstructure" axiom, however, requires qualification: the base is the whole of productive relationships, not only a given economic element, e.g. the working class; historically, the superstructure varies and develops unevenly in society's different activities; for example, art, politics, economics, etc.
The extended base of a triangle (a particular case of an extended side) is the line that contains the base. When the triangle is obtuse and the base is chosen to be one of the sides adjacent to the obtuse angle , then the altitude dropped perpendicularly from the apex to the base intersects the extended base outside of the triangle.
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On the other hand, if a chemical is a weak acid its conjugate base will not necessarily be strong. Consider that ethanoate, the conjugate base of ethanoic acid, has a base splitting constant (Kb) of about 5.6 × 10 −10, making it a weak base. In order for a species to have a strong conjugate base it has to be a very weak acid, like water.