The manufacturer of pellet powder will introduce the color of iron to you.
Color of iron: usually silver white solid or gray black powder.
The divalent iron ions are light green and easily oxidized to trivalent iron ions in alkaline solution. With the increase of hydrolysis degree, the color of Fe3 + changed from yellow to brown. Pure iron ions are lavender.
Iron is a variable valence element with only 0-valent reduction, 3-valent only oxidation, and 2-valent reduction and oxidation.
At room temperature, iron is not easy to react with non-metallic substances such as oxygen, sulfur, chlorine in dry air. If there are impurities, it is easy to rust in humid air; if there is acid gas or halogen steam, it will rust faster. At high temperature, the reaction is violent. For example, iron burns in oxygen to form Fe3O4, while hot iron reacts with water vapor to form Fe3O4. When heated, it can be combined with halogen, sulfur, silicon, carbon, phosphorus and so on. In addition to the 2 and 3 valence oxides, it also forms the composite oxide Fe3O4 (magnetic oxide).
Iron is easily soluble in dilute inorganic acid, forming divalent iron salt and releasing hydrogen. When meeting concentrated sulfuric acid or nitric acid at room temperature, a layer of oxide film is formed on the surface to passivate iron. Therefore, iron products can be used to contain concentrated sulfuric acid or concentrated nitric acid. When heated, iron can react with concentrated sulfuric acid or nitric acid to produce + 3 iron salt and SO2 or NO2 at the same time
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