There are various more specific definitions for the concept of an alkali. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. 1. Alkali resistant glass fibres containing zirconium dioxide for the use in concrete. 'All Intensive Purposes' or 'All Intents and Purposes'? any of various other … 14th century, in the meaning defined at sense 1, Middle English, from Medieval Latin, from Arabic al-qili the ashes of the plant saltwort. The base is bitter in taste and is slippery in nature. Acids, bases and alkalis are found in the laboratory and at home. Alkali metals are all soft, shiny reactive metals. 8. Bases are slippery in nature but bitter in taste. Which of the following refers to thin, bending ice, or to the act of running over such ice. 7. These soils can occur naturally, due to the presence of alkali salts. Sentence Examples. Learner's definition of ALKALI. Cyclobutane is a cyclic alkane, and it has four carbon (C) atoms, so n = 4. noun Alkali metal. An acid is a chemical species that can be neutralized by a base. 1. any base or hydroxide, as soda, potash, etc. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! A base that can dissolve in water is also called an alkali. The word "alkali" is derived from Arabic al qalīy (or alkali), meaning the calcined ashes (see calcination), referring to the original source of alkaline substances. Accessed 15 Jan. 2021. show acidic characters in aqueous solutions because they are able to generate H + ions in aqueous solutions while solutions of compounds like alcohol and glucose … Key Terms: Acid, Alkali, Alkali Earth Metals, Alkaline, Aquatic Chemistry, Bases, Lewis Acid, pH, Strong Acids, Weak Acids. 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. They have a silvery appearance and are very soft and shiny. Bleach, for example, is used to clean clothes and your house and has a pH of around 12. eurlex-diff-2018-06-20. Together with hydrogen they constitute group 1, which lies in the s-block of the periodic table.All alkali metals have their outermost electron in an s-orbital: this shared electron configuration results in their having very similar characteristic properties. In chemistry, an alkali (/ˈælkəlaɪ/; from Arabic: القلوي al-qaly "ashes of the saltwort") is a basic, ionic salt of an alkali metal or alkaline earth metal chemical element. Learn a new word every day. Chemistry. The main difference between alkali metals and alkaline earth metals is that alkali metals have one valence electron in the outermost orbit whereas alkaline earth metals have two valence electrons in the outermost orbit. [noncount] smaller amounts of alkali. For other uses, see, Learn how and when to remove this template message, alkali – definition of alkali by the Free Online Dictionary, Thesaurus and Encyclopedia, https://en.wikipedia.org/w/index.php?title=Alkali&oldid=997527365, Short description with empty Wikidata description, Wikipedia indefinitely semi-protected pages, Articles needing additional references from June 2008, All articles needing additional references, Creative Commons Attribution-ShareAlike License, Moderately concentrated solutions (over 10, Alkaline solutions are slippery or soapy to the touch, due to the, A basic salt of an alkali metal or alkaline earth metal, Any base that is soluble in water and forms hydroxide ions, This page was last edited on 31 December 2020, at 23:42. Any of various soluble mineral salts found in … Acids and bases can neutralise each other. As ashes are mixed with water used for cleaning products and are made of … 3 : a soluble salt or a mixture of soluble salts present in some soils of arid regions in quantity detrimental to agriculture. Please tell us where you read or heard it (including the quote, if possible). Alkali salts are soluble hydroxides of alkali metals and alkaline earth metals, of which common examples are: Soils with pH values that are higher than 7.3 are usually defined as being alkaline. alkali Any moisture infiltrating the concrete - stemming for example from rainwater - reacts with these alkali metals, leading to an alkaline solution. The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids). The technique coats a tungsten plug with aluminosilicate doped with an alkalimetal, which is then sintered onto the tungsten. Base reacts with the acid in order to make it neutral. HCl, HNO 3, etc. The word 'Alkali' comes from the Arabic 'qali' meaning 'from the ashes' since ashes mixed with water used as cleaning products (such as soaps) are made of alkali materials … The process of manufacturing soaps by boiling fatty acids with caustic alkalis or sodium carbonate came into practice with the development of the manufacture of candles by saponifying fats, for it provided a means whereby the oleic acid, which is valueless for candle making, could be worked up. Example of a strong ba… 2. Alkali metals Alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium. These sources work by applying a layer of alkalimetalatoms on a low work function substrate, usually tungsten. Types of bases are a strong base and a weak base.