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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
    Alkalis are all Arrhenius bases, ones which form hydroxide ions (OH −) when dissolved in water Common properties of alkaline aqueous solutions include: Moderately concentrated solutions (over 10 −3 M) have a pH of 10 or greater This means that they will turn phenolphthalein from colorless to pink
  • 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
  • What Is An Alkali In Chemistry? | The Science Blog
    Alkalis are associated with a group of alkali metals and their compounds These metals include hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr)
  • Alkali - Simple English Wikipedia, the free encyclopedia
    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 Often it is the salt of an Alkali metal
  • What Is an Alkali? Definition, Properties Uses
    An alkali is a substance that dissolves in water and produces a solution with a pH above 7 More specifically, it’s a water-soluble base that releases hydroxide ions when mixed with water All alkalis are bases, but not all bases are alkalis, because some bases don’t dissolve in water
  • 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
  • ALKALI Simple Definition - Merriam-Webster
    The simple definition of ALKALI is a substance that has a bitter taste and that forms a salt when mixed with an acid
  • Alkalis: Properties Neutralisation | O Level | Mini Chemistry
    D Alkalis form metal hydroxide precipitates (from metal salt solutions) Alkalis are used to form insoluble metal hydroxides (precipitates) from solutions of metal salts
  • 10 Most common alkalis and their uses - Monarch Chemicals
    In this blog, we explore the top ten and their uses in everyday life What is an alkali? An alkali is a substance with a pH of greater than 7 Alkalis can neutralise acids and denoted on a litmus test by the colour blue Although they can neutralise acids, don’t think of them as safe





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