The difference between Acid and Alkali
When used as nouns, acid means a sour substance, whereas alkali means one of a class of caustic bases, such as soda, soda ash, caustic 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.
Acid is also adjective with the meaning: sour, sharp, or biting to the taste.
check bellow for the other definitions of Acid and Alkali
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Acid as an adjective:
Sour, sharp, or biting to the taste; tart; having the taste of vinegar.
Examples:
"'acid fruits or liquors"
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Acid as an adjective (figuratively):
Sour-tempered.
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Acid as an adjective:
Of or pertaining to an acid; acidic.
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Acid as an adjective (music):
Denoting a musical genre that is a distortion (as if hallucinogenic) of an existing genre, as in acid house, acid jazz, acid rock.
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Acid as a noun:
A sour substance.
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Acid as a noun (chemistry):
Any of several classes of compound having the following properties: Any of a class of water-soluble compounds, having sour taste, that turn blue litmus red, and react with some metals to liberate hydrogen, and with bases to form salts. Any compound that easily donates protons; a Brønsted acid Any compound that can accept a pair of electrons to form a covalent bond; a Lewis acid
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Acid as a noun (slang):
lysergic acid diethylamide (LSD)
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Alkali as a noun (chemistry):
One of a class of caustic bases, such as soda, soda ash, caustic 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.
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Alkali as a noun (Western United States):
Soluble mineral matter, other than common salt, contained in soils of natural waters.