patents-wipo. Many household cleaners are alkali. Key Terms: Acid, Alkali, Alkali Earth Metals, Alkaline, Aquatic Chemistry, Bases, Lewis Acid, pH, Strong Acids, Weak Acids. The technique coats a tungsten plug with aluminosilicate doped with an alkalimetal, which is then sintered onto the tungsten. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! Alkali resistant glass fibres containing zirconium dioxide for the use in concrete. alkali - WordReference English dictionary, questions, discussion and forums. Example of a strong ba… An alkali can also be defined as a base that dissolves in water. In chemistry, an alkali is an aqueous (from water) solution with a pH value of more than 7. Although many plants do prefer slightly basic soil (including vegetables like cabbage and fodder like buffalo grass), most plants prefer a mildly acidic soil (with pHs between 6.0 and 6.8), and alkaline soils can cause problems.[1]. Learn a new word every day. alkali example sentences. There are multiple definitions of the base. Although they are soft enough to cut with a knife, exposing a bright surface, the metals react with water and air and quickly tarnish, so the pure metals are stored in an inert atmosphere or under oil to prevent oxidation. eurlex-diff-2018-06-20. These sources work by applying a layer of alkalimetalatoms on a low work function substrate, usually tungsten. Example sentences with "alkali mineral", translation memory. Alkalis are usually defined as a subset of the bases. ăl'kə-lī' The definition of an alkali is a soluble salt that comes from the ashes of plants and is made up of mostly potassium or sodium carbonate. patents-wipo. After heating this substance with calcium hydroxide (slaked lime), a far more strongly basic substance known as caustic potash (potassium hydroxide) was produced. The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids). These metals are extremely reactive. 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 Trish Gant / Getty Images Science. Sentence Examples. 2. Delivered to your inbox! ; Alkali Soda ash; caustic soda, caustic potash, etc. a group of elements with similar properties, which usually falls into columns on the periodic table Periodic Table Interactive: Describe the properties of each element category. Definition of Alkaline in Chemstry It's an aqueous solution with a pH greater than 7 ... Email Print Glass beakers indicating blue for weak alkaline level, green for strong alkali level, and red for weak acidity level. Alkali metals Alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium. Alkali metal, any of the six chemical elements that make up Group 1 (Ia) of the periodic table —namely, lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). Examples of base: zinc hydroxideand copper oxide. An alkali is derived from the Arabic word 'qali' means ' from the ashes'. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. 1. noun A substance having highly basic properties; a strong base. Most metals form carbonates (aluminium and chromium are exceptions), the alkali metals yielding both acid and normal carbonates of the types Mhco 3 and M 2 CO 3 (M = one atom of a monovalent metal); … 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. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'alkali.' noun Alkali metal. Please tell us where you read or heard it (including the quote, if possible). any of various bases, the hydroxides of the alkali metals and of ammonium, that neutralize acids to form salts and turn red litmus paper blue. 2. Bleach, for example, is used to clean clothes and your house and has a pH of around 12. from The Century Dictionary. 7. However, ConsumerLab has identified at least one product with alkalized cocoa that is high in flavanols. that is soluble in water and gives a high concentration of hydroxyl ions in solution; specif., any of the hydroxides and carbonates of the alkali metals. Learner's definition of ALKALI. Example sentences with "alkali resistance", translation memory. Any of various soluble mineral salts found in … The base is bitter in taste and is slippery in nature. Which of the following refers to thin, bending ice, or to the act of running over such ice. Plant potash lent the name to the element potassium, which was first derived from caustic potash, and also gave potassium its chemical symbol K (from the German name Kalium), which ultimately derived from alkali. Caustic potash was traditionally used in conjunction with animal fats to produce soft soaps, one of the caustic processes that rendered soaps from fats in the process of saponification, one known since antiquity. Send us feedback. In alkali lakes (also called soda lakes), evaporation concentrates the naturally occurring carbonate salts, giving rise to an alkalic and often saline lake. Chemistry. any of various other … noun Word forms: plural ˈalkaˌlies or ˈalkaˌlis. Acids, bases and alkalis are found in the laboratory and at home. This article examines, 1. 2 : alkali metal. As ashes are mixed with water used for cleaning products and are made of … Alkalis are all Arrhenius bases, ones which form hydroxide ions (OH−) when dissolved in water. Sodium oxide and potassium oxide are alkalis which dissolve in water to form soluble bases sodium hydroxide and potassium hydroxide respectively. 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. A solution of a soluble base has a pH greater than 7.0. When dipped in water it becomes a solution. See more. Definition of alkali metal : any of the monovalent mostly basic metals of group I of the periodic table comprising lithium, sodium, potassium, rubidium, cesium, and francium — see Periodic Table Examples of alkali metal in a Sentence Example sentences with the word alkali. A substance used to neutralize acid is called a base. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. Alkali metals are all soft, shiny reactive metals. Alkali salts are soluble hydroxides of alkali metals and alkaline earth metals, of which common examples are: An alkali is a chemical compound that is a type of base. Definition: The term alkali is used to refer to metals found in group 1 of the periodic table: ... NaOH is an example of a strong base while NH3 is an example of a weak base. A carbonate or hydroxide of an alkali metal, the aqueous solution of which is bitter, slippery, caustic, and characteristically basic in reactions. alkali mineral. – Definition, Properties, Examples 3. Base reacts with the acid in order to make it neutral. 3. Types of bases are a strong base and a weak base. Alkali metal definition, any of the group of univalent metals including potassium, sodium, lithium, rubidium, cesium, and francium, whose hydroxides are alkalis. 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. : a substance that has a bitter taste and that forms a salt when mixed with an acid. Alkali (Chem) One of a class of caustic bases, such as soda, potash, ammonia, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue. Accessed 15 Jan. 2021. The bases which are soluble in water are called alkali. b. 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 … Some of the bases that form a neutral product with acids are metal hydroxides and metal oxides. Example 2: Cyclobutane. The four carbon atoms are bonded to each other, making one ring. Sodium hydroxide is a base which is soluble in water and hence it is an alkali. 1. What made you want to look up alkali? 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. Of particular concern appears the amount of alkalis released from concrete aggregates that, according to laboratory leaching tests on aggregate samples, may significantly increase the alkali … 5. A compound is said to be acidic in character if it is able to generate H+ ions in aqueous solutions. Alkalis are bases which are completely soluble in water. One of two subsets is commonly chosen. See the full definition for alkali in the English Language Learners Dictionary, Nglish: Translation of alkali for Spanish Speakers, Britannica.com: Encyclopedia article about alkali. All Free. Alkali, any of the soluble hydroxides of the alkali metals—i.e., lithium, sodium, potassium, rubidium, and cesium. noun This term, used in the commercial sense, includes the carbonates of sodium and potassium, formerly called mild alkalis, and the hydroxide of the same metals, the caustic alkalis. Properties, examples 2 to make it neutral types define alkali with example bases is also called an alkali is derived from Arabic! Types of bases are a strong base and a weak base, caustic potash,.! Subscribe to America 's largest dictionary and get thousands more definitions and advanced search—ad free ba… How use. It has four carbon ( C ) atoms, so n = 4 the examples do not the! 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