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phosphoric acid (fos-for´ik)

O=P(OH)3; Orthophosphoric acid;a strong acid of industrial importance; m.p. 42.35°C; dilute solutions have been used as urinary acidifiers and as dressings to remove necrotic debris. In dentistry, it comprises about 60% of the liquid used in zinc phosphate and silicate cements; solutions are used for conditioning enamel surfaces prior to applications of various types of resins.
cyclic p.a. 1. in general, a linear polymer of phosphoric acid residues in pyrophosphate linkage in which the a and omega residues are similarly linked to make one endless loop or cyclic compound; 2. specifically, a generic term applied to compounds in which one phosphoric acid residue is esterified to two hydroxyl groups of a single carbon chain, as in adenosine 3´,5´-phosphoric acid, adenosine 2´,3´-phosphoric acid, etc.
dilute p.a. a solvent containing 10% H3PO4.
glacial p.a. (HPO3)n;an anhydride of phosphoric acid used as a reagent, and in the manufacture of zinc oxyphosphate cement for dentistry.metaphosphoric acid;

acid (as´id)

1. A compound yielding a hydrogen ion in a polar solvent (e.g., in water); a.'s form salts by replacing all or part of the ionizable hydrogen with an electropositive element or radical. 2. In popular language, any chemical compound that has a sour taste (given by the hydrogen ion). 3. Sour; sharp to the taste. 4. Relating to a.; giving an a. reaction. For individual acids, see specific names. [L. acidus, sour]
bile a.'s steroid a.'s found in bile; e.g., taurocholic and glycocholic a.'s, used when biliary secretion is inadequate and for biliary colic. Their physiological roles include fat emulsification. Their synthesis is reduced in disorders of the peroxisomes.
Broonsted a. an a. that is a proton donor.
conjugate a. the protonated compound of two compounds that differ in structure only by the presence of the labile proton.
dibasic a. an a. containing two ionizable atoms of hydrogen in the molecule. See acid (1).
fatty a. See fatty acid.
inorganic a. an a. made up of molecules not containing organic radicals; e.g., HCl, H2SO4, H3PO4.
Lewis a. an a. that is an electron pair acceptor.
monobasic a. an a. containing one ionizable atom of hydrogen in the molecule. See acid (1).
organic a. an a. made up of molecules containing organic radicals; e.g., acetic a., citric a., which contain the ionizable -COOH group.
polybasic a. an a. containing more than three ionizable atoms of hydrogen in the molecule. See acid (1).
ruberythric acid (ru-ber´e-thrik) a glycoside of alizarin and a disaccharide containing d-xylose and d-glucose residues found in the roots of the madder plant.
wax a. a long-chain monocarboxylic a. with an even number of carbons, often found esterified in waxes (e.g., lauric acid).


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