Iron Sulfates

sulfates of divalent and trivalent iron, FeSO₄ and Fe₂(SO₄)₃.

The sulfate of divalent iron separates from aqueous solutions at 1.82°–56.8°C as pale green crystals of FeSO₄.7H₂O, known in industry as green vitriol. The solubility of anhydrous FeSO₄ in 100 g of water is as follows: 26.6 g at 20°C and 54.4 g at 56°C. Green vitriol can be made by treating scrap iron or cuttings of roofing iron with dilute sulfuric acid. In industry it is a by-product of the pickling of iron sheets, wire, or other articles with dilute H₂SO₄ to remove scale. It is used in making ink, in dyeing (to dye wool black), and to preserve wood.

Ferric sulfate forms crystalline hydrates containing various amounts of water—for example, Fe₂(SO₄)₃.9H₂O (yellow). It is readily soluble in water. It forms iron alums with sulfates of alkali metals and (NH₄)₂SO₄. It is made industrially by dissolving ferric oxide in 75–80 percent sulfuric acid. It is used in water purification as a coagulant and for making iron alum.

单词	iron sulfates
释义	Iron Sulfates Iron Sulfates sulfates of divalent and trivalent iron, FeSO₄ and Fe₂(SO₄)₃. The sulfate of divalent iron separates from aqueous solutions at 1.82°–56.8°C as pale green crystals of FeSO₄.7H₂O, known in industry as green vitriol. The solubility of anhydrous FeSO₄ in 100 g of water is as follows: 26.6 g at 20°C and 54.4 g at 56°C. Green vitriol can be made by treating scrap iron or cuttings of roofing iron with dilute sulfuric acid. In industry it is a by-product of the pickling of iron sheets, wire, or other articles with dilute H₂SO₄ to remove scale. It is used in making ink, in dyeing (to dye wool black), and to preserve wood. Ferric sulfate forms crystalline hydrates containing various amounts of water—for example, Fe₂(SO₄)₃.9H₂O (yellow). It is readily soluble in water. It forms iron alums with sulfates of alkali metals and (NH₄)₂SO₄. It is made industrially by dissolving ferric oxide in 75–80 percent sulfuric acid. It is used in water purification as a coagulant and for making iron alum.
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