What type of chemical reaction takes place when ferrous sulphate crystals are heated in a dry test tube?

Question

Answer

When ferrous sulphate crystals(Fe So4) are heated in a dry test tube the following reaction can be observed>>>,
Feso4---(heat)---->Fe2O3+So2+So3,
which is an example of decomposition reaction

Answer

Thermal decomposition reaction occurs when ferrous sulphate crystals are heated in a dry test tube.

Answer

Answer

Following two observations are observed when crystalsof ferrous sulphate areheated: (1) Change in state and color takes place. (2) A gas is evolved during this process. Since, the compound (ferrous sulphate) decomposes into two or more substances therefore, it is a decomposition reaction.

Answer

Decomposition reaction.

Answer

Decomposition reaction (Thermal)

On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their colour changes from light green to white. On further heating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3).

Answer

Decomposotion reaction

Answer

Chemical Reaction when Ferrous Sulphate Crystals are Heated:

When ferrous sulphate crystals (FeSO4) are heated in a dry test tube, a chemical reaction called thermal decomposition occurs. This reaction involves the breakdown of the compound into simpler substances due to the application of heat. Here is a detailed explanation of the reaction:

1. Formula and Properties of Ferrous Sulphate:
- Ferrous sulphate has a chemical formula of FeSO4 and is a blue-green crystalline solid.
- It is commonly known as green vitriol or iron(II) sulphate.
- Ferrous sulphate is soluble in water and has a molecular weight of 151.91 g/mol.

2. Reaction Equation:
The thermal decomposition of ferrous sulphate can be represented by the following equation:

2FeSO4(s) → Fe2O3(s) + SO2(g) + SO3(g)

3. Explanation of the Reaction:
- When ferrous sulphate crystals are heated in a dry test tube, the solid crystals lose their water of crystallization.
- The water molecules attached to the FeSO4 crystals are driven off as steam due to the applied heat, leaving behind an anhydrous compound.
- The thermal decomposition of ferrous sulphate results in the formation of three new substances: iron(III) oxide (Fe2O3), sulphur dioxide (SO2), and sulphur trioxide (SO3).
- Iron(III) oxide is a reddish-brown solid, while sulphur dioxide and sulphur trioxide are gases.

4. Observations:
During the heating process, several observable changes can be noted:
- Initially, the ferrous sulphate crystals may appear blue-green in color.
- As the crystals are heated, they turn white or pale gray, indicating the loss of water of crystallization.
- Steam or water vapor is evolved from the test tube.
- A change in color and appearance of the residue may occur, indicating the formation of iron(III) oxide.

5. Significance:
The thermal decomposition of ferrous sulphate is an example of a chemical reaction that releases gases and forms new compounds. This reaction is useful in various applications, such as:
- In the laboratory, it is commonly used to produce sulphur dioxide gas.
- It is also used in the production of pigments, such as iron oxide, which is used in paints, cosmetics, and dyes.

In conclusion, when ferrous sulphate crystals are heated in a dry test tube, the thermal decomposition reaction occurs, resulting in the formation of iron(III) oxide, sulphur dioxide, and sulphur trioxide. This reaction is observed through the loss of water of crystallization, color changes, and the evolution of steam.

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