tribasicadj.

Brit.

/trʌɪˈbeɪsɪk/, U.S.

/traɪˈbeɪsɪk/

Etymology: < Greek τρι-, tri- comb. form + βάσις base + -ic suffix.

Chemistry.

Having three bases.

1. Of an acid: Having the property of exchanging three atoms of hydrogen for three of potassium or sodium, and thus forming a salt; e.g. phosphoric acid, H₃PO₄, which reacts with sodium hydroxide, NaOH, forming trisodium phosphate, Na₃PO₄. Of a salt: Containing three molecules of the basic oxide; e.g. tribasic lead acetate.In the first half of the 19th cent., the acid oxide was considered to be the acid itself (not as now when acid means the compound of this oxide with water), and tribasic acid was applied to an oxide which united with three equivalents of base to form a salt: hence the name.

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the world > matter > chemistry > chemical substances > acids > [adjective] > relating to acids general > proton donating power

tribasic1837

monobasic1842

tetrabasic1863

polyprotic1944

1837 T. Graham in Philos. Trans. (Royal Soc.) 127 63 A new nomenclature of these salts..I offer for consideration..Tribasic phosphate of water..(3 HO, PO₅). Tribasic phosphate of water and soda..(NaO, 2 HO, PO₅). Tribasic phosphate of soda and water..(2 NaO, HO, PO₅). Tribasic phosphate of soda..(3 NaO, PO₅).

1849 D. Campbell Pract. Text-bk. Inorg. Chem. 317 Salts which are isomorphous with the salts of tribasic phosphoric acid.

1862 W. A. Miller Elements Chem. (ed. 2) III. 255 The..synthetic experiments of Berthelot..have shown that the ordinary varieties of natural fats and oils, are the tribasic ethers of the triatomic alcohol glycerin.

1875 R. Hunt & F. W. Rudler Ure's Dict. Arts (ed. 7) III. 863 Phosphates of Soda... The principal are the normal tribasic phosphate, the well-known rhombic phosphate [etc.].

1890 J. Cagney tr. R. von Jaksch Clin. Diagnosis vii. 278 Being a tribasic acid, it forms three classes of salts—acid, neutral, and basic.

†2. Of an element: = triatomic adj. b. Obsolete.

ΘΚΠ

the world > matter > chemistry > valency > [adjective] > having a valency of three

triatomic1862

tribasic1862

ter-equivalent1866

trivalent1868

tervalent1869

triadic1882

1862 W. A. Miller Elements Chem. (ed. 2) III. 52 Triatomic or Tribasic elements, each atom of which is in combination equivalent to H₃ or three atoms of hydrogen.

1880 E. Cleminshaw tr. C. A. Wurtz Atomic Theory 204 Nitrogen has been represented as a tribasic element derived from the type of three condensed molecules of hydrogen.

This entry has not yet been fully updated (first published 1914; most recently modified version published online March 2022).

单词	tribasic
释义	tribasicadj. Brit. /trʌɪˈbeɪsɪk/, U.S. /traɪˈbeɪsɪk/ Etymology: < Greek τρι-, tri- comb. form + βάσις base + -ic suffix. Chemistry. Having three bases. 1. Of an acid: Having the property of exchanging three atoms of hydrogen for three of potassium or sodium, and thus forming a salt; e.g. phosphoric acid, H₃PO₄, which reacts with sodium hydroxide, NaOH, forming trisodium phosphate, Na₃PO₄. Of a salt: Containing three molecules of the basic oxide; e.g. tribasic lead acetate.In the first half of the 19th cent., the acid oxide was considered to be the acid itself (not as now when acid means the compound of this oxide with water), and tribasic acid was applied to an oxide which united with three equivalents of base to form a salt: hence the name. ΘΚΠ the world > matter > chemistry > chemical substances > acids > [adjective] > relating to acids general > proton donating power tribasic1837 monobasic1842 tetrabasic1863 polyprotic1944 1837 T. Graham in Philos. Trans. (Royal Soc.) 127 63 A new nomenclature of these salts..I offer for consideration..Tribasic phosphate of water..(3 HO, PO₅). Tribasic phosphate of water and soda..(NaO, 2 HO, PO₅). Tribasic phosphate of soda and water..(2 NaO, HO, PO₅). Tribasic phosphate of soda..(3 NaO, PO₅). 1849 D. Campbell Pract. Text-bk. Inorg. Chem. 317 Salts which are isomorphous with the salts of tribasic phosphoric acid. 1862 W. A. Miller Elements Chem. (ed. 2) III. 255 The..synthetic experiments of Berthelot..have shown that the ordinary varieties of natural fats and oils, are the tribasic ethers of the triatomic alcohol glycerin. 1875 R. Hunt & F. W. Rudler Ure's Dict. Arts (ed. 7) III. 863 Phosphates of Soda... The principal are the normal tribasic phosphate, the well-known rhombic phosphate [etc.]. 1890 J. Cagney tr. R. von Jaksch Clin. Diagnosis vii. 278 Being a tribasic acid, it forms three classes of salts—acid, neutral, and basic. †2. Of an element: = triatomic adj. b. Obsolete. ΘΚΠ the world > matter > chemistry > valency > [adjective] > having a valency of three triatomic1862 tribasic1862 ter-equivalent1866 trivalent1868 tervalent1869 triadic1882 1862 W. A. Miller Elements Chem. (ed. 2) III. 52 Triatomic or Tribasic elements, each atom of which is in combination equivalent to H₃ or three atoms of hydrogen. 1880 E. Cleminshaw tr. C. A. Wurtz Atomic Theory 204 Nitrogen has been represented as a tribasic element derived from the type of three condensed molecules of hydrogen. This entry has not yet been fully updated (first published 1914; most recently modified version published online March 2022). < adj.1837
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