![]() ![]() An excess of ammonia or sodium hydroxide will dissolve the precipitate, again, so a nearly stoichiometric amount is recommended. With the precipitate filtered out, chromium hydroxide can finally be precipitated from the solution using ammonia, sodium hydroxide, or sodium carbonate. Iron can be precipitated out as iron(III) sulfate by reacting the resulting solution with sulfuric acid or sodium sulfate in a heated, oxidative environment. See Preparation for extraction of chromium from this.Īluminothermic reactions (thermites) with chromium(III) oxide may form chromium metal.Ĭhromium hydroxide can be produced from stainless steel by first dissolving the metal in hot hydrochloric acid. Stainless steel is another option.Ĭhromium makes up 10% or more of stainless steel, a very accessible metal to the home chemist. Chromoly, which consists of iron, chromium and molybdenum, tends to have a relatively high concentration of chromium compared to other alloys. Pure chromium metal is hard to find, as it tends to be alloyed with different metals. It has a density of 7.19 g/cm 3 Availability Chromium metal has a high melting point of 1907 ☌ and boils at 2671 ☌. It is antiferromagnetic at room temperature, and is the only element that exhibits this property at such high temperatures. Nitric acid can enhance this passivation layer, but reducing agents tend to destroy it.Ĭhromium is a shiny silver color and is quite hard and brittle. It tends to form a thin passivation layer of chromium(III) oxide, which prevents further oxidation. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |