What is acid?

  • (adj): Containing acid.
    Example: "An acid taste"
    See also — Additional definitions below


An acid (from the Latin acidus/acēre meaning sour) is a substance which reacts with a base. Commonly, acids can be identified as tasting sour, reacting with metals such as calcium, and bases like sodium carbonate. Aqueous acids have a pH under 7, with acidity increasing the lower the pH. Chemicals or substances having the property of an acid are said to be acidic.

Read more about Acid.

Some articles on acid:

Lipoic Acid - Biological Sources and Degradation
... Lipoic acid is found in almost all foods, but slightly more so in kidney, heart, liver, spinach, broccoli, and yeast extract ... Naturally occurring lipoic acid is always covalently bound and not readily available from dietary sources ... Additionally, the amount of lipoic acid present is very low ...
Common Acids - Nucleic Acids
... Deoxyribonucleic acid (DNA) Ribonucleic acid (RNA). ...
Lipoic Acid
... Lipoic acid (LA), also known as α-lipoic acid and alpha lipoic acid (ALA) is an organosulfur compound derived from octanoic acid ... The carbon atom at C6 is chiral and the molecule exists as two enantiomers (R)-(+)-lipoic acid (RLA) and (S)-(-)-lipoic acid (SLA) and as a racemic mixture (R/S)-lipoic acid (R ... as a yellow solid and structurally contains a terminal carboxylic acid and a terminal dithiolane ring ...
Lipoic Acid - Biosynthesis and Attachment
... The precursor to lipoic acid, octanoic acid, is made via fatty acid biosynthesis in the form of octanoyl-acyl carrier protein ... In eukaryotes, a second fatty acid biosynthetic pathway in mitochondria is used for this purpose ... As a result, lipoic acid is synthesized on the lipoyl domain and no free lipoic acid is produced ...
Monosodium Glutamate - Safety - United States
... Monosodium glutamate (MSG) is one of several forms of glutamic acid found in foods, in large part because glutamic acid, being an amino acid, is pervasive in nature ... Glutamic acid and its salts can be present in a wide variety of other additives, including hydrolyzed vegetable protein, autolyzed yeast, hydrolyzed yeast, yeast extract, soy ... by the food industry when using glutamic acid (which is similar to MSG, lacking only the sodium ions) ...

More definitions of "acid":

  • (noun): Any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt.