Dichromic acid

HjCr.O, dichromic acid H2S2O7 disulfuric acid... [Pg.221]

This is apparentiy the reason for the high washfastness of these complexes as compared to their unmetallized precursors (48). The dichromate-acid after-treatment that is used technically oxidizes primarily cystine configurations ia the wool, which converts Cr(VI) to Cr(III). Alternatively, the fiber may be pretreated with dichromate whereby essentially the same final shade is obtained, although it is not known whether the same complexes are formed. [Pg.437]

Bichromatldsung, /. dichromate solution, bichromsauer, a. of or combined with dichromic acid, dichromate of. bicyclish, a. bicyclic. [Pg.70]

Chromium(VI) oxide, Cr03, is the acid anhydride of chromic acid, H2Cr04, and dichromic acid, H2Cr207. Recall that there is no change in oxidation state when an acid anhydride is converted to the corresponding acid and so the oxidation state of Cr is +6 in both acids. [Pg.437]

Pyridinium dichromate Dichromic acid, compd. with pyridine (1 2) (8) Chromic acid (H2Cr207), compd. with pyridine (1 2) (20039-37-6)... [Pg.100]

Safety. The addition of concentrated sulphuric acid on sodium (or potassium) dichromate is to produce chromium trioxide, which is a powerful oxidizing agent capable of oxidizing carbon to carbon dioxide. The solution is loosely called chromic acid, but although true chromic acid H CrO has not been isolated, the aqueous solution contains dichromic acid, The... [Pg.79]

The red oxide is the acid anhydride of two acids, namely, chromic acid, H2Cr04 or Cr02(OH)2 and the dichromic acid H2Cr207. Both the chromic and dichromic acids exist only in the aqueous solution and have not been isolated from the solution. Dissolution of CrOs in water produces H+ ion along with dichromate ion, Cy20i as follows ... [Pg.227]

Very si sol in water. Explodes (but not violently) on heating Hexamethylenetetramine-Dichromic Acid. [(CH2)6N4] 2.H2Cr207 mw 498.46, N 22.48% yel crysts was prepd by Cambier and Brochet (Refs 1,2 3). Explodes violently... [Pg.80]

The product slowly deposits solids on standing the supers natant liquid, however, is still fairly pure. It reacts with cold water to form a mixture of hydrochloric and dichromic acids H2Cr207 but dissolves without reaction in carbon tetrachloride. [Pg.127]

When pyridine is added to a solution of chromium trioxide in water, it is possible to obtain a precipitate of the pyridinium salt of dichromic acid, that is pyridinium dichromate (PDC).11... [Pg.3]

Cr03 + H2O —> H2C1O4 chromic add 2Cr03 + H2O —> H2O2O7 dichromic acid... [Pg.350]

Potassium dichromate Dichromic acid, dipotassium salt (8) Chromic acid dipotassium salt (9) (7778-50-9)... [Pg.89]

The salts of dichromic acid are called dichromates they contain the dichromate ion, Cro07—Sexivalent chromium also forms another important series of salts, the chromates, which contain the ion CrO —. [Pg.520]

Oxidation states of chromium - -2, - -3, and -f-6. Oi es of chromium chronate, FeCr204, and crocoite, PbCr04. Chromium metal and its alloys ferrochrome, alloy steels, stainless steel. The aluminothermic process (Goldschrtiidt process). Electrolytic chromium. Chromium trioxide, chromic acid, dichromic acid, potassium chromate, potassium didiromate, sodium chromate, lead chromate. Equilibrium between chromate ion and dichromate ion. Chrome-tanned leather. Chromic oxide (chrome green) chromic ion, chrome alum, chromic chloride, chromic hydroxide, chromite ion. Chromous compounds. Peroxy-chromic acid. [Pg.529]

In dilute aqueous solution the chief constituent is undoubtedly dichromic acid, HjCr O, and a study of the molecular solution volumes and molecular refraetivities of chromic acid, potassium chromate, and potassium diehromate affords further evidence in support of tliis formula for the acid. ... [Pg.43]

H,Ci04 H CrjO HCIO4 " chromic acid dichromic acid. perchloric acid hydrogen tetraoxochlorate tetraoxochromic acid /i-oxo-hexaoxodichromic acid tetraoxochloric acid... [Pg.1033]

Concerning the solution, the anions of the chromic acid (CrO j-) and of dichromic acid (Cr202-) form an equilibrium... [Pg.309]

Note that Examples 10-14 above show how one may easily name transition metal compounds that have been named as acids in the past. Names such as permanganic acid, dichromic acid, etc., are not included in the present recommendations because they represent an area where it is difficult to systematize and decide what to include, and where the names are not needed for organic nomenclature, as opposed to the corresponding acid names for acids of main group elements. [Pg.137]

Neither permanganic acid nor dichromic acid has been isolated in pure form. Many stable salts of both are well known. [Pg.392]

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