Copper Sulphate
Appearance:
- Copper sulphate is a blue crystalline solid at room temperature.
Behavior at 100°C:
- When heated to approximately 100 degrees Celsius, it undergoes a chemical change. It loses water molecules and is converted into a bluish-white salt. This transition is due to the removal of water from the crystal structure, resulting in a change in its color and physical properties.
Copper sulphate’s transition from its blue crystalline form to a bluish-white salt upon heating at 100°C is a well-known characteristic, and it plays a significant role in various chemical processes and experiments.
Physical Properties:
- Appearance: Blue Crystalline Solid
- Color Change at 100°C: Loses water and becomes a bluish-white salt
- Further Heating Beyond 250°C: Becomes anhydrous and turns white in color
- Density: 3.603 g/cc (Anhydrous)
Sodium Dichromate
Appearance:Sodium dichromate typically presents itself as bright orange-red crystals or a fine powder. It is well-known for its distinctive reddish-orange color.
Physical Properties:
- Density: 2.52 g/cc
- Solubility in Water: 73 g in 100 mL of water
Chemical Reactions:
- Concentrated Hydrochloric Acid (HCl): Sodium dichromate with concentrated HCl yields chlorine gas.
- Sulphuric Acid (H2SO4): It produces oxygen when reacted with sulphuric acid.
Chromic Acid
Appearance: Chromic acid is typically found as a reddish-brown
Physical Properties:
- Solubility: 169 g in 100 mL of water
- Density: 1.201 g/cc
- Melting Point: 197°C
Chemical Properties:
- Chromic acid turns blue litmus paper to red, indicating its acidic nature.
These descriptions provide an overview of the properties and reactions of Copper Sulphate, Sodium Dichromate, and Chromic Acid. These chemicals have distinct characteristics and can be used in various chemical processes and reactions.
