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