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alkalis    
n. 硷质

硷质

Alkali \Al"ka*li\ (?; 277), n.; pl. {Alkalis} or {Alkalies}. [F.
alcali, ultimately fr. Ar. alqal[imac] ashes of the plant
saltwort, fr. qalay to roast in a pan, fry.]
1. Soda ash; caustic soda, caustic potash, etc.
[1913 Webster]

2. (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.
[1913 Webster]

3. Soluble mineral matter, other than common salt, contained
in soils of natural waters. [Western U. S.]
[Webster 1913 Suppl.]

{Fixed alkalies}, potash and soda.

{Vegetable alkalies}. Same as {Alkaloids}.

{Volatile alkali}, ammonia, so called in distinction from the
fixed alkalies.
[1913 Webster]


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  • Alkali - Wikipedia
    In chemistry, an alkali ( ˈælkəlaɪ ⓘ; from the Arabic word al-qāly, القالِي) is a basic salt of an alkali metal or an alkaline earth metal An alkali can also be defined as a base that dissolves in water A solution of a soluble base has a pH greater than 7 0
  • Alkali | Chemical Compound, Properties Uses | Britannica
    alkali, any of the soluble hydroxides of the alkali metals— i e , lithium, sodium, potassium, rubidium, and cesium 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 tissues
  • ALKALI Definition Meaning - Merriam-Webster
    The meaning of ALKALI is 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 How to use alkali in a sentence
  • Acids and Alkalis - BBC Bitesize
    Acids and alkalis are common in daily life They are found in the home, in our bodies, in industry, car batteries and school science labs One of the jobs of a chemist is to tell the difference
  • What Is An Alkali In Chemistry? | The Science Blog
    Alkalis are bases that dissolve in water On the pH scale, they sit above 7 They are derived from alkali metals, such as sodium and potassium, or alkaline earth metals, like calcium Alkalis are highly reactive and corrosive, capable of breaking down organic materials easily
  • Alkali - Simple English Wikipedia, the free encyclopedia
    In chemistry, an alkali is an aqueous (from water) solution with a pH value of more than seven 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 An alkali is where a base is dissolved in water
  • What is an Alkali? | Alkaline Solution
    An alkali is a basic hydroxide or ionic salt of an alkali metal or alkaline earth metal element, which is soluble in water Only few alkalis are known, examples, sodium hydroxide (NaOH), potassium hydroxide (KOH), calcium hydroxide (Ca (OH) 2), calcium carbonate (CaCO 3), and magnesium hydroxide (Mg (OH)2
  • Alkali Examples and Their Everyday Uses
    When you think of alkalis, do you picture cleaning products or perhaps chemical reactions? Alkalis play a crucial role in both everyday life and industrial applications Understanding alkali examples gives you insight into their importance, from the baking soda in your kitchen to the sodium hydroxide used in manufacturing
  • 3. 1: The Alkali Metal Elements - Chemistry LibreTexts
    The Group 1 metals have a particular name: the alkali metals This is due to the formation of alkali (basic) solutions upon their reaction with water Table 3 1 3 3 1 3 1 lists the derivation of the names of the alkali metals Table 3 1 3 3 1 3 1: Derivation of the names of each of the alkali metal elements
  • What Is An Alkaline Substance? - Sciencing
    A list of alkalis found in the everyday world includes all of the alkali metals on the periodic table of elements combined with –OH to create a hydroxide: lithium, sodium, potassium, rubidium and cesium Calcium, strontium, barium and ammonium hydroxide are also considered alkalis





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