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alkali 中文解釋 wordnet sense Collocation Usage Collins Definition
Noun
/ˈalkəˌlī/,
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alkalis, plural;
  1. A chemical compound that neutralizes or effervesces with acids and turns litmus blue; typically, a caustic or corrosive substance of this kind such as lime or soda

  1. base: any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water; "bases include oxides and hydroxides of metals and ammonia"
  2. a mixture of soluble salts found in arid soils and some bodies of water; detrimental to agriculture
  3. 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 ...
  4. (Alkalis) Substances with a pH above 7. Often used as neutralisers in cosmetics and toiletries.
  5. (Alkalis) Use their pH level to clean. An example is a degreaser. Alkaline cleaning products are used for heavier and more specialized tasks, e.g., stripping polish from a floor. Alkaline cleaners are corrosive, they can damage surfaces and cause injury to a person. They should be used with care.
  6. (Alkalis) compounds capable of neutralizing acids and usually characterized by an acid taste. Can be mild like baking soda or highly caustic like lye.
  7. (alkalis) (in  alkali metal (chemical element))
  8. ALKALIS are substances which dissociate and release OHñ ions into the solution.
  9. A chemical substance which effectively neutralizes acid material so as to form neutral salts. A base. The opposite of acid. Examples are ammonia and caustic soda.
  10. A group of water soluble mineral compounds usually considered to have moderate strengths as bases as opposed to the caustic or strongly basic hydroxides, although this differentiation is not always made. ...
  11. Also called a Base. An alkali is the opposite of acid and is used to increase the pH or total alkalinity of swimming pool water. Most common are sodium carbonate or sodium hydroxide to increase pH, and sodium bicarbonate to increase total alkalinity.
  12. A substance which creates a bitter taste and a slippery feel when dissolved in water and will turn litmus paper blue. An alkali has a pH greater than 7.0 and is the opposite of an acid. Highly alkaline waters tend to cause drying of the skin.
  13. A basic solution that neutralizes acids by releasing carbonates and/or hydroxides.
  14. Any strongly basic substance of hydroxide and carbonate, such as soda, potash, etc., that is soluble in water and increases the pH of a solution.
  15. Also called base - A Class of compounds which will react with an acid to give a salt. Alkali is the opposite of acid.
  16. A base which is soluble in water. They are usually metal hydroxides eg. sodium hydroxide, but ammonia solution is also an alkali.
  17. A water-soluble mineral compound, usually a moderate strength base (as opposed to caustic hydroxide), such as a bicarbonate and carbonate compound when it is present in the water. The measurement of constituents in a water supply which determine alkaline conditions. ...
  18. Various soluble salts, principally of sodium, potassium, magnesium, and calcium, that have the property of combining with acids to form neutral salts and may be used in chemical water treatment processes.
  19. These waters contain high levels of alkali metal ions, usually sodium and potassium
  20. In chemistry, a substance capable of forming hydroxyl (OH-) ions when dissolved in water. Alkaline materials may be added to materials to neutralise acids or as an alkaline reserve or buffer for the purpose of counteracting acids which may form in the future. ...
  21. a substance that contains hydroxide ions in solution. Alkaline solutions have a pH greater than 7 and turn litmus paper blue.
  22. A chemical substance that, when dissolved in water, creates a hydrogen ion concentration lower than 10-7 moles/liter. This term has also been used with paper products to imply the inclusion of an alkaline buffer.
  23. A water soluble hydroxide on one of the alkali metals. The term is virually synonymous with the term base. An example is Sodium Hydroxide, NaOH.
  24. A substance that is the chemical opposite of an acid.
  25. Any chemical substance which forms soluble soaps with fatty acids. Alkalis are also referred to as bases. May cause severe burns to the skin. Alkalis turn litmus paper blue and have ph values from 8 to 14.