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  • mixture
  • The term chromic acid is usually used for a mixture made by adding concentrated sulfuric acid to a dichromate, which may contain a variety of compounds, including solid chromium trioxide. (wikipedia.org)
  • This kind of chromic acid may be used as a cleaning mixture for glass. (wikipedia.org)
  • At first the colour changes from orange (dichromate) to red (chromic acid) and then deep red crystals of chromium trioxide precipitate from the mixture, without further colour change. (wikipedia.org)
  • Because a solution of chromic acid in sulfuric acid (also known as a sulfochromic mixture or chromosulfuric acid) is a powerful oxidizing agent, it can be used to clean laboratory glassware, particularly of otherwise insoluble organic residues. (wikipedia.org)
  • molecular
  • Chromic acid may also refer to the molecular species, H2CrO4 of which the trioxide is the anhydride. (wikipedia.org)
  • Molecular chromic acid could in principle be made by adding chromium trioxide to water (cf. manufacture of sulfuric acid). (wikipedia.org)
  • CrO3 + H2O ⇌ H2CrO4 but in practice the reverse reaction occurs when molecular chromic acid is dehydrated. (wikipedia.org)
  • Chromium trioxide is the anhydride of molecular chromic acid. (wikipedia.org)
  • Dichromic acid, H2Cr2O7, (structure illustrated top right) is the fully protonated form of the dichromate ion and also can be seen as the product of adding chromium trioxide to molecular chromic acid. (wikipedia.org)
  • leaves
  • Furthermore, the acid leaves trace amounts of paramagnetic chromic ions - Cr(III) - that can interfere with certain applications, such as NMR spectroscopy. (wikipedia.org)
  • A chromic acid dip leaves behind a bright yellow patina on the brass. (wikipedia.org)