Alkali, any of the soluble hydroxides of the alkali metals—i.e., lithium, sodium, potassium, rubidium, and cesium. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'alkali.' Some of the bases that form a neutral product with acids are metal hydroxides and metal oxides. From the Cambridge English Corpus. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. Alkalis are bases which are completely soluble in water. 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. noun A substance having highly basic properties; a strong base. Alkali metals Alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium. Definition of alkali. Learner's definition of ALKALI. Acids, bases and alkalis are found in the laboratory and at home. How to use alkali in a sentence. Cyclobutane is a cyclic alkane, and it has four carbon (C) atoms, so n = 4. Cocoa processed with alkali, commonly called "dutched" cocoa, is not unsafe, but may offer less health benefit due to a reduction in flavanols. 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. 2. Bleach, for example, is used to clean clothes and your house and has a pH of around 12. 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. In chemistry, an alkali is an aqueous (from water) solution with a pH value of more than 7. Define family. noun Alkali metal. 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. b. 8. One of two subsets is commonly chosen. 14th century, in the meaning defined at sense 1, Middle English, from Medieval Latin, from Arabic al-qili the ashes of the plant saltwort. 1. any base or hydroxide, as soda, potash, etc. ; Alkali Soda ash; caustic soda, caustic potash, etc. 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. [count] strong alkalis. eurlex-diff-2018-06-20. 'Nip it in the butt' or 'Nip it in the bud'? 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 … The adjective alkaline is commonly, and alkalescent less often, used in English as a synonym for basic, especially for bases soluble in water. any of various other … lies. noun Word forms: plural ˈalkaˌlies or ˈalkaˌlis. This article examines, 1. alkali - WordReference English dictionary, questions, discussion and forums. patents-wipo. A carbonate or hydroxide of an alkali metal, the aqueous solution of which is bitter, slippery, caustic, and characteristically basic in reactions. 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. Base reacts with the acid in order to make it neutral. The base is bitter in taste and is slippery in nature. 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. patents-wipo. Example of a strong ba… In alkali lakes (also called soda lakes), evaporation concentrates the naturally occurring carbonate salts, giving rise to an alkalic and often saline lake. 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]. When dipped in water it becomes a solution. Definition and Examples of Acid-Base Indicator. Examples of alkali metal. 7. Sodium oxide and potassium oxide are alkalis which dissolve in water to form soluble bases sodium hydroxide and potassium hydroxide respectively. 2 : alkali metal. 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. Alkali salts are soluble hydroxides of alkali metals and alkaline earth metals, of which common examples are: An acid is a chemical species that can be neutralized by a base. A base that can dissolve in water is also called an alkali. Example 2: Cyclobutane. HCl, HNO 3, etc. What are Alkali Metals – Definition, Characteristics, Properties, Examples 2. The metallic derivatives (phenolates, phenates or carbolates) of the alkali metals are obtained by dissolving phenol in a solution of a caustic alkali, in the absence of air. As ashes are mixed with water used for cleaning products and are made of … However, ConsumerLab has identified at least one product with alkalized cocoa that is high in flavanols. The alkali metals consist of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr). Delivered to your inbox! “Alkali.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/alkali. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. Advertisement. The word "alkali" is derived from Arabic al qalīy (or alkali),[1] meaning the calcined ashes (see calcination), referring to the original source of alkaline substances. Test your knowledge - and maybe learn something along the way. 2. Sentence Examples. Example sentences with the word alkali. Examples of base: zinc hydroxideand copper oxide. Which of the following refers to thin, bending ice, or to the act of running over such ice. 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. Please tell us where you read or heard it (including the quote, if possible). 5. Trish Gant / Getty Images Science. 1. What is the difference between Acid and Alkaline – Comparison of Key Differences. All Free. Types of bases are a strong base and a weak 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); … After heating this substance with calcium hydroxide (slaked lime), a far more strongly basic substance known as caustic potash (potassium hydroxide) was produced. See more. Alkali resistant glass fibres containing zirconium dioxide for the use in concrete. 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. : a substance that has a bitter taste and that forms a salt when mixed with an acid. These soils can occur naturally, due to the presence of alkali salts. Send us feedback. Alkalis are usually defined as a subset of the bases. [noncount] smaller amounts of alkali. 'All Intensive Purposes' or 'All Intents and Purposes'? Learn a new word every day. These metals are extremely reactive. What made you want to look up alkali? 2. There are multiple definitions of the base. 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. 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. The technique coats a tungsten plug with aluminosilicate doped with an alkalimetal, which is then sintered onto the tungsten. 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 … 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. Sodium hydroxide is a base which is soluble in water and hence it is an alkali. 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. Common properties of alkaline aqueous solutions include: The terms "base" and "alkali" are often used interchangeably, particularly outside the context of chemistry and chemical engineering. Acids and bases can neutralise each other. – Definition, Properties, Examples 3. 3. 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 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). Example sentences with "alkali mineral", translation memory. Many household cleaners are alkali. They produce salt molecules and water on reacting with acids. An alkali is a chemical compound that is a type of base. Bases are slippery in nature but bitter in taste. The four carbon atoms are bonded to each other, making one ring. 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. 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. Basic, ionic salt of an alkali metal or alkaline earth metal chemical element, "Alkaline" redirects here. What is an Acid. 3 : a soluble salt or a mixture of soluble salts present in some soils of arid regions in quantity detrimental to agriculture. A substance used to neutralize acid is called a base. This broad use of the term is likely to have come about because alkalis were the first bases known to obey the Arrhenius definition of a base, and they are still among the most common bases. The second subset of bases is also called an "Arrhenius base". The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids). from The Century Dictionary. translation and definition "alkali mineral", Dictionary English-English online. There are various more specific definitions for the concept of an alkali. alkali Any moisture infiltrating the concrete - stemming for example from rainwater - reacts with these alkali metals, leading to an alkaline solution. Accessed 15 Jan. 2021. A compound is said to be acidic in character if it is able to generate H+ ions in aqueous solutions. Alkalis are all Arrhenius bases, ones which form hydroxide ions (OH−) when dissolved in water. A water-extract of burned plant ashes, called potash and composed mostly of potassium carbonate, was mildly basic. These sources work by applying a layer of alkalimetalatoms on a low work function substrate, usually tungsten. alkali example sentences. The company, which acquired several area properties from Dow Chemical in 2015, previously announced plans to close its chlor, According to one report on recent cases of milk-, Post the Definition of alkali to Facebook, Share the Definition of alkali on Twitter. They have a silvery appearance and are very soft and shiny. Alkali metals are all soft, shiny reactive metals. alkali mineral. A solution of a soluble base has a pH greater than 7.0. The bases which are soluble in water are called alkali. 6. 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 Any of various soluble mineral salts found in … An alkali can also be defined as a base that dissolves in water. 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 … 1. Lye and calcium carbonate are each an example of an alkali. 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. Example sentences with "alkali resistance", translation memory. Alkali metal definition, any of the group of univalent metals including potassium, sodium, lithium, rubidium, cesium, and francium, whose hydroxides are alkalis. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Chemistry. 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. chemistry. Alkali Metal Properties . An alkali is derived from the Arabic word 'qali' means ' from the ashes'. 4. 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