![]() In industry it is produced by the precipitation of chromium sulphate with solutions of sodium hydroxide or ammonium hydroxide. Synthesis of chromium hydroxide in the industrial field Thus, both the acidic and the basic medium are capable of dissolving the chromium hydroxide. This negative complex is associated with the surrounding cations (Na +, if the base is NaOH), and after the evaporation of the water the sodium chromite salt precipitates (NaCrO 2, emerald green). When all the Cr (OH 2 ) 3 (OH) 3 Once it has reacted, a final complex is obtained as indicated by the chemical equation:Ĭr (OH 2 ) 3 (OH) 3 + 3 OH - 3- + 3 H 2 OR This complex makes the solution a light green color, which intensifies as the reaction proceeds. On the other hand, when more base is added, the OH - they continue replacing the water molecules, forming the negative complex. When reacting with acids, Cr (OH 2 ) 3 (OH) 3 it dissolves because the hydroxyl bridges break down, responsible for the gelatinous appearance of the precipitate. This property is characteristic of Cr 3+. Why is chromium hydroxide soluble in acidic and basic solutions? The reason is due to its amphoteric character, which allows it to react with both acids and bases. In addition, when heated, it decomposes, producing vapors of chromium oxide. It is insoluble in water, but soluble in strong acids and bases. The Cr (OH) 3 It has the appearance of a blue-green powder, but when it comes into contact with the water it forms a gelatinous gray-green precipitate. However, it is the physicochemical studies of the solid that can shed light on the true structure of Cr (OH) 3 in this point.
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