Diphosphorous acid

H3AS04 arsenic acid H4P2O2 diphosphoric acid (or pyro-... [Pg.221]

Pyrophosphoric (diphosphoric) acid, H4P2O2, is the only condensed phosphoric acid definitely obtainable ia crystalline form. It has a theoretical P2O5 content of 79.8%. However, Hquid polyphosphoric acid of such content shows by analysis only 42.5% the remainder is phosphoric acid and... [Pg.330]

Orthophosphoric acid is a remarkable substance it can only be obtained pure in the crystalline state (mp 42.35°C) and when fused it slowly undergoes partial self-dehydration to diphosphoric acid ... [Pg.518]

As diphosphoric acid is tetrabasic, four series of salts are possible though not all are always known, even for simple cations. The most studied are those of Na, K, NH4 and Ca, e.g. ... [Pg.527]

Chemical Name 2-Methyl-l, 4-naphthalenediol diphosphoric acid ester tetrasodium salt Common Name —... [Pg.927]

There also exists interference from diphosphoric acid, other more highly condensed phosphoric acids, and their organic derivatives. The free phosphoric acid can be determined as a heteropolyacid complex of phosphoric acid and ammonium molybdate. Afterward the complex is reduced by stannum II chloride to molybdenum blue. The amount of this dye can be measured photometricly at 625 nm. Organic derivatives of phosphoric acid and condensed phosphoric acids do not interfere with this method. [Pg.617]

If a sugar is esterified with two or more phosphate groups, the compound is termed bisphosphate, trisphosphate etc. (e.g. fructofuranose 1,6-bisphosphate). The term diphosphate denotes an ester with diphosphoric acid, e.g. adenosine S -diphosphate. [Pg.113]

Ci0H15N5O10P2 -3 HaO Adenosine 5 -diphosphoric acid, trihydrate ADENDP20 43 334... [Pg.413]

HP03/ which is known as metaphosphoric acid, and it is a strong acid. We can view the formation of ff4P207 (known as diphosphoric acid or pyrophosphoric acid) as arising from the addition of P205 to ff3P04 or the removal of a molecule of water from two molecules of H3P04. The first process can be shown as... [Pg.514]

DIPT, see Isopropyl ether Dipentyl, see Decane Diphenyl, see Biphenyl 1,1 -Diphenyl, see Biphenyl 4,4 -Diphenylenediamine, see Benzidine p,p -Diphenylenediamine, see Benzidine Diphenylenemethane, see Fluorene o-Diphenylenemethane, see Fluorene Diphenylene oxide, see Dibenzofuran Diphenyl ether, see Phenyl ether s/m-Diphenylhydrazine, see 1,2-Diphenylhydrazine lV,A/ -Diphenylhydrazine, see 1,2-Diphenylhydrazine Diphenylnitrosamine, see IV-Nitrosodiphenylamine Diphenyl-lV-nitrosamine, see IV-Nitrosodiphenylamine A,lV-Diphenylnitrosamine, see IV-Nitrosodiphenylamine A,Al-Diphenyl-lV-nitrosamine, see IV-Nitrosodiphenylamine Diphenyl oxide, see Phenyl ether Diphenyltrichloroethane, see p,p -DDT Diphosphoric acid, tetraethyl ester, see Tetraethyl pyrophosphate... [Pg.1479]

A feature of phosphoric acid is that it forms a series of poiymeric anhydrides that resembie carboxyiic acid anhydrides in structure and reactivity. Diphosphoric acid (formeriy caiied pyrophosphoric... [Pg.277]

Pyrophosphate (also known as diphosphate) or 1 207" . The conjugate base of pyrophosphoric acid (or, diphosphoric acid), H4P2O7 (having pi a values, at 25°C, of 0.85, 1.96, 6.60, and 9.41). Crystals of tetrasodium pyrophosphate (mp = 988°C) are very soluble in water. The pyrophosphate anion hydrolyzes to orthophosphate however, the rate of hydrolysis is much slower than that of pyrophosphoric acid. The hydrated form of tetrasodium pyrophosphate exhibits a shght degree of efflorescence. [Pg.534]

Formula H3PO4 MW 97.995 also forms a hemihydrate H3P04 l/2 H2O [16271-20-8], known as diphosphoric acid crystals of anhydrous acid or hemi-... [Pg.697]

Diphosphinedihalonickel(II) complexes planar-tetrahedral spin equilibrium, 32 29-30 reaction coordinate profile, 32 31 Diphosphoric acid, dissociation constants for, 4 25... [Pg.83]

Oisodium dihydrogen pyrophosphate Pyrophosphoric acid, disodium salt (8) Diphosphoric acid, disodium salt (9) (7758-16-9)... [Pg.246]

The existence in diphosphoric acid of two strongly and two weakly dissociated H+ ions has been known for a long time. New determinations cf the separate dissociation constants have given the values ... [Pg.24]

TRISAMMONIUM GERANYL DIPHOSPHATE (Diphosphoric acid, mono(3,7-dimethyl-2,6-octadienyl) ester (E)-, trisammonium salt)... [Pg.211]

Diphosphoric acid appears to be a specific catalyst for the formation of coumarins from 1,3-dimethoxybenzene and /3-keto esters (62JOC4704). An interesting aspect of this synthesis is the cleavage of the ether function involved in the cyclization. [Pg.801]

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