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单词 alkali
释义

alkali

/ˈalkəlʌɪ /
noun (plural alkalis)
1A compound with particular chemical properties including turning litmus blue and neutralizing or effervescing with acids; typically, a caustic or corrosive substance of this kind such as lime or soda: flint is not subject to chemical weathering except by strong alkalis [mass noun]: the reaction is followed by measuring the concentration of alkali at various times...
  • Amides are hydrolysed to ammonium salts with catalysis by acids or alkalis.
  • They resist most chemicals, including many acids, alkalis, oxidizing agents, and solvents.
  • Nickel has good resistance to corrosion in the normal atmosphere, in natural freshwaters and in deaerated nonoxidizing acids, and it has excellent resistance to corrosion by caustic alkalis…
Often contrasted with acid and base1.
1.1 [as modifier] chiefly North American Alkaline.A vast white alkali flat unrolled across the field of his dream, ringed with serrated purple mountains at the horizon....
  • Additionally, clinically, if CO2 tensions venture into the range of 80-100 mm Hg in critically patients, the use of alkali therapy is generally mandatory.
  • For the first few days, the country presented picturesque timbered bottomlands and rolling prairie, but slowly it changed to a rocky landscape littered with buffalo bones and stagnant pools of undrinkable alkali water.

Alkalis release hydroxide ions (OH) when dissolved in water. Any solution with a pH of more than 7 is alkaline.

Derivatives

alkalimeter

/alkəˈlɪmɪtə/ noun

alkalimetry

/alkəˈlɪmɪtri/ noun

Origin

Late Middle English (denoting a saline substance derived from the ashes of various plants, including glasswort): from medieval Latin, from Arabic al-qalī 'calcined ashes (of the glasswort etc.)', from qalā 'fry, roast'.

  • The chemistry term alkali is from medieval Latin, from Arabic al-kalī ‘calcined ashes’ referring to the plants from which alkalis were made. Early 19th-century alkaloid (a class of compounds including morphine, quinine, and strychnine) was coined in German from alkali.

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更新时间:2024/12/25 22:32:18