Ferrous sulfate is a chemical compound with the formula FeSO₄, commonly used as a supplement to treat iron deficiency anemia and in various industrial applications, including water treatment and dyeing.
List any two observations when Ferrous Sulphate (FeSO₄) is heated in a dry test tube?
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• light green color changes to reddish-browny color
• Colorless gas is evolved
• Gas with choking smell is evolved
When ferrous sulfate (FeSO₄) is heated in a dry test tube, two observations can be made:
Color Change: Initially, ferrous sulfate is typically green or bluish-green in color. As it is heated, the water of crystallization is driven off, and the color of the compound may change. The hydrated form of ferrous sulfate, known as iron(II) sulfate heptahydrate (FeSO₄·7H₂O), loses water molecules upon heating, and the color may change to white or a lighter shade.
Formation of Oxides: As the temperature increases, ferrous sulfate undergoes thermal decomposition. This process leads to the formation of iron oxides, such as iron(II) oxide (FeO) or iron(III) oxide (Fe₂O₃), depending on the specific conditions and the extent of heating. The color change associated with the formation of these oxides can be observed, and in some cases, the residue may appear reddish-brown or black.
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