Definition of alkali in English:

alkali

nounPlural alkalis ˈalkəlʌɪˈælkəˌlaɪ

A 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.
碱。常与ACID 相对；比较BASE
Alkalis release hydroxide ions (OH⁻) when dissolved in water. Any solution with a pH of more than 7 is alkaline
flint is not subject to chemical weathering except by strong alkalis
Often contrasted with acid and base
mass noun the reaction is followed by measuring the concentration of alkali at various times
Example sentencesExamples
- They resist most chemicals, including many acids, alkalis, oxidizing agents, and solvents.
- Amides are hydrolysed to ammonium salts with catalysis by acids or alkalis.
- Zinc is a fairly active metal that dissolves in both acids and strong alkalis.
- Like semi-permanent dyes, permanent dyes are also alkalis.
- Caustic alkalis react with the paint coating and loosen it from the surface.
- It can withstand high temperatures and is resistant to many corrosive substances such as acids and alkalis.
- Corrosives (mineral acids, alkalis, phenols) are in this category.
- The high-density overlay protects the wood substrate from alkalis and water.
- Nitriles can be decomposed by acids or alkalis to give the corresponding carboxylic acid or they can be reduced to give primary amines.
- Tellurium reacts with both acids and some alkalis.
- It accounted for acids and alkalis, for respiration and the smells of plants.
- Soap is made by combining a fat source (either animal or vegetable) and an alkali in a chemical process known as saponification.
- Platinum also dissolves in hot alkalis such as hot sodium hydroxide or potassium hydroxide.
- Copper is a moderately reactive metal that dissolves in most acids and alkalis.
- It combines with most non-metals at high temperatures and reacts with both acids and alkalis.
- Concentrated acids and caustic alkalis should be handled with the greatest care.
- 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…
- On contact, strong acids, alkalis, and heavy metals cause chemical burns.
- Carboxylic acids also react with alkalis, or bases.
- Chemically, aluminum will react with the alkalis in concrete and produce hydrogen bubbles.
Synonyms
caustic, corroding, eroding, erosive, abrasive, biting, mordant, burning, stinging

Derivatives

alkalimeter
〈主北美〉碱的

noun alkəˈlɪmɪtə

alkalimetry
〈主北美〉碱的

noun alkəˈlɪmɪtri

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.

Definition of alkali in US English:

alkali

nounˈælkəˌlaɪˈalkəˌlī

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.
碱。常与ACID 相对；比较BASE
Alkalis release hydroxide ions (OH⁻) when dissolved in water. Any solution with a pH of more than 7 is alkaline
flint is not subject to chemical weathering except by strong alkalis
Often contrasted with acid; compare with base
mass noun the reaction is followed by measuring the concentration of alkali at various times
Example sentencesExamples
- Caustic alkalis react with the paint coating and loosen it from the surface.
- Tellurium reacts with both acids and some alkalis.
- Like semi-permanent dyes, permanent dyes are also alkalis.
- Platinum also dissolves in hot alkalis such as hot sodium hydroxide or potassium hydroxide.
- Nitriles can be decomposed by acids or alkalis to give the corresponding carboxylic acid or they can be reduced to give primary amines.
- Zinc is a fairly active metal that dissolves in both acids and strong alkalis.
- Carboxylic acids also react with alkalis, or bases.
- It combines with most non-metals at high temperatures and reacts with both acids and alkalis.
- The high-density overlay protects the wood substrate from alkalis and water.
- 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…
- Concentrated acids and caustic alkalis should be handled with the greatest care.
- Chemically, aluminum will react with the alkalis in concrete and produce hydrogen bubbles.
- Amides are hydrolysed to ammonium salts with catalysis by acids or alkalis.
- Corrosives (mineral acids, alkalis, phenols) are in this category.
- It can withstand high temperatures and is resistant to many corrosive substances such as acids and alkalis.
- It accounted for acids and alkalis, for respiration and the smells of plants.
- On contact, strong acids, alkalis, and heavy metals cause chemical burns.
- Soap is made by combining a fat source (either animal or vegetable) and an alkali in a chemical process known as saponification.
- Copper is a moderately reactive metal that dissolves in most acids and alkalis.
Synonyms
caustic, corroding, eroding, erosive, abrasive, biting, mordant, burning, stinging

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’.

单词	alkali
释义	Definition of alkali in English: alkali nounPlural alkalis ˈalkəlʌɪˈælkəˌlaɪ A 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. 碱。常与ACID 相对；比较BASE Alkalis release hydroxide ions (OH⁻) when dissolved in water. Any solution with a pH of more than 7 is alkaline flint is not subject to chemical weathering except by strong alkalis Often contrasted with acid and base mass noun the reaction is followed by measuring the concentration of alkali at various times Example sentencesExamples They resist most chemicals, including many acids, alkalis, oxidizing agents, and solvents. Amides are hydrolysed to ammonium salts with catalysis by acids or alkalis. Zinc is a fairly active metal that dissolves in both acids and strong alkalis. Like semi-permanent dyes, permanent dyes are also alkalis. Caustic alkalis react with the paint coating and loosen it from the surface. It can withstand high temperatures and is resistant to many corrosive substances such as acids and alkalis. Corrosives (mineral acids, alkalis, phenols) are in this category. The high-density overlay protects the wood substrate from alkalis and water. Nitriles can be decomposed by acids or alkalis to give the corresponding carboxylic acid or they can be reduced to give primary amines. Tellurium reacts with both acids and some alkalis. It accounted for acids and alkalis, for respiration and the smells of plants. Soap is made by combining a fat source (either animal or vegetable) and an alkali in a chemical process known as saponification. Platinum also dissolves in hot alkalis such as hot sodium hydroxide or potassium hydroxide. Copper is a moderately reactive metal that dissolves in most acids and alkalis. It combines with most non-metals at high temperatures and reacts with both acids and alkalis. Concentrated acids and caustic alkalis should be handled with the greatest care. 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… On contact, strong acids, alkalis, and heavy metals cause chemical burns. Carboxylic acids also react with alkalis, or bases. Chemically, aluminum will react with the alkalis in concrete and produce hydrogen bubbles. Synonyms caustic, corroding, eroding, erosive, abrasive, biting, mordant, burning, stinging Derivatives alkalimeter 〈主北美〉碱的 noun alkəˈlɪmɪtə alkalimetry 〈主北美〉碱的 noun alkəˈlɪmɪtri 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. Definition of alkali in US English: alkali nounˈælkəˌlaɪˈalkəˌlī 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. 碱。常与ACID 相对；比较BASE Alkalis release hydroxide ions (OH⁻) when dissolved in water. Any solution with a pH of more than 7 is alkaline flint is not subject to chemical weathering except by strong alkalis Often contrasted with acid; compare with base mass noun the reaction is followed by measuring the concentration of alkali at various times Example sentencesExamples Caustic alkalis react with the paint coating and loosen it from the surface. Tellurium reacts with both acids and some alkalis. Like semi-permanent dyes, permanent dyes are also alkalis. Platinum also dissolves in hot alkalis such as hot sodium hydroxide or potassium hydroxide. Nitriles can be decomposed by acids or alkalis to give the corresponding carboxylic acid or they can be reduced to give primary amines. Zinc is a fairly active metal that dissolves in both acids and strong alkalis. Carboxylic acids also react with alkalis, or bases. It combines with most non-metals at high temperatures and reacts with both acids and alkalis. The high-density overlay protects the wood substrate from alkalis and water. 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… Concentrated acids and caustic alkalis should be handled with the greatest care. Chemically, aluminum will react with the alkalis in concrete and produce hydrogen bubbles. Amides are hydrolysed to ammonium salts with catalysis by acids or alkalis. Corrosives (mineral acids, alkalis, phenols) are in this category. It can withstand high temperatures and is resistant to many corrosive substances such as acids and alkalis. It accounted for acids and alkalis, for respiration and the smells of plants. On contact, strong acids, alkalis, and heavy metals cause chemical burns. Soap is made by combining a fat source (either animal or vegetable) and an alkali in a chemical process known as saponification. Copper is a moderately reactive metal that dissolves in most acids and alkalis. Synonyms caustic, corroding, eroding, erosive, abrasive, biting, mordant, burning, stinging 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’.
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