Question

Explain The Preparation of Sulphuric Acid​

Answer 1

Explanation:

How Sulphuric acid is produced? Sulphuric acid is produced from sulfur. In the presence of air, sulfur dioxide is first obtained by burning the molten sulfur. In the presence of a catalyst for vanadium pentoxide, sulfur dioxide is then converted to sulfur trioxide.

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Answer 2

Preparation of sulphuric acid are :

Preparation of sulfur dioxide :

SO2 is prepared by burning sulphur in the presence of excess air so that the product combines with oxygen which is helpful for the next stage.

S(s) + O2 (g) → SO2(g)

Conversion of sulfur dioxide into sulfur trioxide :

Sulphur trioxide is formed when sulphur dioxide reacts with oxygen in a ratio of 1:1 at a temperature of 400°C – 450°C and a pressure of 1-2 atm in the presence of V2O5 as a catalyst. This reaction is reversible in nature.

2SO2(g) + O2(g) ⇌ 2SO3(g)

Conversion of sulfur trioxide formed into concentrated H2SO4 :

The sulphur trioxide formed is first made to react with concentrated sulphuric acid. Sulphur trioxide cannot be dissolved in water directly as it leads to the formation of fog. The product obtained after this reaction is known as oleum. The oleum obtained is then dissolved in water to obtain concentrated sulphuric acid.

H2SO4 + SO3(g) → H2S2O7(l)

H2S2O7(l) + H2O(l) → 2H2SO4

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