Learner's definition of 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. Cocoa processed with alkali, commonly called "dutched" cocoa, is not unsafe, but may offer less health benefit due to a reduction in flavanols. Sentence Examples. 6. The base is bitter in taste and is slippery in nature. A carbonate or hydroxide of an alkali metal, the aqueous solution of which is bitter, slippery, caustic, and characteristically basic in reactions. 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. Base reacts with the acid in order to make it neutral. Alkali resistant glass fibres containing zirconium dioxide for the use in concrete. 'All Intensive Purposes' or 'All Intents and Purposes'? When dipped in water it becomes a solution. Sodium oxide and potassium oxide are alkalis which dissolve in water to form soluble bases sodium hydroxide and potassium hydroxide respectively. 4. They have a silvery appearance and are very soft and shiny. What is an Acid. Acids and bases can neutralise each other. 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 … From the Cambridge English Corpus. Definition and Examples of Acid-Base Indicator. Alkali metals Alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium. Basic, ionic salt of an alkali metal or alkaline earth metal chemical element, "Alkaline" redirects here. Which of the following refers to thin, bending ice, or to the act of running over such ice. Types of bases are a strong base and a weak base. Alkali, any of the soluble hydroxides of the alkali metals—i.e., lithium, sodium, potassium, rubidium, and cesium. As ashes are mixed with water used for cleaning products and are made of … 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. Example sentences with the word alkali. patents-wipo. The four carbon atoms are bonded to each other, making one ring. 3. Many household cleaners are alkali. 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 … 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]. [count] strong alkalis. The alkali metals are so called because reaction with water forms alkalies (i.e., strong bases capable of neutralizing acids). 1. any base or hydroxide, as soda, potash, etc. One of two subsets is commonly chosen. Delivered to your inbox! 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. 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. 2. 14th century, in the meaning defined at sense 1, Middle English, from Medieval Latin, from Arabic al-qili the ashes of the plant saltwort. 2. patents-wipo. A water-extract of burned plant ashes, called potash and composed mostly of potassium carbonate, was mildly basic. A solution of a soluble base has a pH greater than 7.0. Lye and calcium carbonate are each an example of an alkali. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. 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. Examples of alkali metal. 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. alkali example sentences. Definition of alkali. An alkali is derived from the Arabic word 'qali' means ' from the ashes'. 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 noun Word forms: plural ˈalkaˌlies or ˈalkaˌlis. 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. translation and definition "alkali mineral", Dictionary English-English online. See more. : a substance that has a bitter taste and that forms a salt when mixed with an acid. Any of various soluble mineral salts found in … 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. Example 2: Cyclobutane. Trish Gant / Getty Images Science. 3 : a soluble salt or a mixture of soluble salts present in some soils of arid regions in quantity detrimental to agriculture. Define family. However, ConsumerLab has identified at least one product with alkalized cocoa that is high in flavanols. 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. HCl, HNO 3, etc. lies. 'Nip it in the butt' or 'Nip it in the bud'? In chemistry, an alkali is an aqueous (from water) solution with a pH value of more than 7. 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. Chemistry. 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. [+] more examples [-] hide examples [+] Example sentences [-] Hide examples. 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