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H 2 CrO 4 (chromic acid) H 2 Cr 2 O 7 (dichromic acid) Molar mass: 118.008 g/mol (chromic acid) 218.001 g/mol (dichromic acid) Appearance Dark purplish-red sand-like crystalline solid or powder [clarification needed] Odor: Odorless Density: 1.201 g/cm 3 [clarification needed] Melting point: 197 °C (387 °F; 470 K) [clarification needed ...
The Pourbaix diagram for chromium in pure water, perchloric acid, or sodium hydroxide [27] [28] 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 are rare, but do nevertheless occasionally exist. [29] [30]
Chromium(III) oxide is amphoteric. Although insoluble in water, it reacts with acid to produce salts of hydrated chromium ions such as [Cr(H 2 O) 6] 3+. [11] It is also attacked by concentrated alkali to yield salts of [Cr(OH) 6] 3−. When heated with finely divided carbon or aluminium, it is reduced to chromium metal: Cr 2 O 3 + 2 Al → 2 Cr ...
Chromium trioxide (also known as chromium(VI) oxide or chromic anhydride) is an inorganic compound with the formula CrO 3. It is the acidic anhydride of chromic acid, and is sometimes marketed under the same name. [6] This compound is a dark-purple solid under anhydrous conditions and bright orange when wet. The substance dissolves in water ...
Chromyl chloride can be prepared by the reaction of potassium chromate or potassium dichromate with hydrogen chloride in the presence of concentrated sulfuric acid, followed by distillation. [3] [4] K 2 Cr 2 O 7 + 6 HCl → 2 CrO 2 Cl 2 + 2 KCl + 3 H 2 O. The sulfuric acid serves as a dehydration agent.
Molar mass: 294.185 g/mol Appearance red-orange crystalline solid Odor: odorless Density: 2.676 g ... has been used to prepare "chromic acid" for cleaning glassware ...
The molar mass of atoms of an element is given by the relative atomic mass of the element multiplied by the molar mass constant, M u ≈ 1.000 000 × 10 −3 kg/mol ≈ 1 g/mol. For normal samples from Earth with typical isotope composition, the atomic weight can be approximated by the standard atomic weight [ 2 ] or the conventional atomic weight.
Molar mass: 392.16 g/mol ... purple crystals (hydrated) Density: 3.10 g/cm 3 ... of respectively anthracene and phenol with chromic acid. A chromium(III) oxide ...