Search results
Results from the WOW.Com Content Network
The Pourbaix diagram for chromium in pure water, perchloric acid, or sodium hydroxide [1] [2] Chromium compounds are compounds containing the element chromium (Cr). Chromium is a member of group 6 of the transition metals. The +3 and +6 states occur most commonly within chromium compounds, followed by +2; charges of +1, +4 and +5 for chromium ...
The chromium(II) hydride monomer, is both thermodynamically and kinetically unstable towards autopolymerization at ambient temperature, and so cannot be concentrated. Nevertheless, molecules of CrH 2 and Cr 2 H 4 have been isolated in solid gas matrices. [1] Cr is the second simplest molecular chromium hydride (after Chromium(I) hydride).
The resulting bright blue solution created from dissolving chromium(II) chloride is stable at neutral pH. [21] Some other notable chromium(II) compounds include chromium(II) oxide CrO, and chromium(II) sulfate CrSO 4. Many chromium(II) carboxylates are known. The red chromium(II) acetate (Cr 2 (O 2 CCH 3) 4) is somewhat famous. It features a Cr ...
Chromium(II) chloride (chromous chloride) – CrCl 2; Chromium(II) sulfate – CrSO 4; Chromium(III) chloride – CrCl 3; Chromium(III) nitrate – Cr(NO 3) 3; Chromium(III) oxide – Cr 2 O 3; Chromium(III) sulfate – Cr 2 (SO 4) 3; Chromium(III) telluride – Cr 2 Te 3; Chromium(IV) oxide – CrO 2; Chromium pentafluoride – CrF 5; Chromyl ...
Predominance diagram for chromate. In aqueous solution, chromate and dichromate anions exist in a chemical equilibrium.. 2 CrO 2− 4 + 2 H + ⇌ Cr 2 O 2− 7 + H 2 O. The predominance diagram shows that the position of the equilibrium depends on both pH and the analytical concentration of chromium.
Substance Formula 0 °C 10 °C 20 °C 30 °C 40 °C 50 °C 60 °C 70 °C 80 °C 90 °C 100 °C Barium acetate: Ba(C 2 H 3 O 2) 2: 58.8: 62: 72: 75: 78.5: 77: 75
The hydrogen content of chromium hydride is between zero and a few hundred parts per million in weight for plain chromium-hydrogen alloys. These values vary depending on alloying elements , such as iron , manganese , vanadium , titanium [ 12 ] and so on.
Loss of the second proton occurs in the pH range 4–8, making the ion [HCrO 4] − a weak acid. [citation needed] Molecular chromic acid could in principle be made by adding chromium trioxide to water (cf. manufacture of sulfuric acid). CrO 3 + H 2 O ⇌ H 2 CrO 4. In practice, the reverse reaction occurs: molecular chromic acid dehydrates ...