I
Any substance that in water solution tastes sour, changes the colour of acid-base indicators (e.g., litmus ), reacts with some metal s (e.g., iron) to yield hydrogen gas, reacts with base s to form salt s, and promotes certain chemical reaction s (e.g., acid catalysis ).
Acids contain one or more hydrogen atoms that, in solution, dissociate as positively charged hydrogen ion s. Inorganic, or mineral, acids include sulfuric acid , nitric acid , hydrochloric acid , and phosphoric acid. Organic acids include carboxylic acid s, phenol s, and sulfonic acids. Broader definitions of acids cover situations in which water is not present. See also acid-base theory .
II
[c mediumvioletred] (as used in expressions)
lysergic acid diethylamide
nicotinic acid
ribonucleic acid
tannic acid
acetic acid
acid and basic rocks
acid rain
acid base theory
amino acid
aspartic acid
carbolic acid
carboxylic acid
citric acid
fatty acid
folic acid
folic acid deficiency anemia
formic acid
glutamic acid
hydrochloric acid
muriatic acid
lactic acid
nitric acid
nucleic acid
oxalic acid
pantothenic acid
salicylic acid
sulfuric acid
tricarboxylic acid cycle
citric acid cycle
uric acid
{{link=ascorbic acid">ascorbic acid