Why is sulphuric acid used in contact process?

Why is sulphuric acid used in contact process?

During this process, sulfur dioxide and oxygen are passed over a hot catalyst (V2O5). They unite to form sulfur trioxide, which combines with water to produce sulfuric acid….Contact Process.

S.No. Stages Chemical equation
1. Production of sulfur dioxide from sulfur Sulfur is melted and then combusted in O2 to form SO2. S + O2 → SO2

Why is so3 not directly added to make sulphuric acid?

The correct answer of this question is option ‘c’, sulphur trioxide is not directly dissolved in water to form sulphuric acid because it results in the formation of dense fog of sulphuric acid which is difficult to condense.

Why oleum is formed in contact process?

Production. Oleum is produced in the contact process, where sulfur is oxidized to sulfur trioxide which is subsequently dissolved in concentrated sulfuric acid. Sulfuric acid itself is regenerated by dilution of part of the oleum.

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Why is sulphur trioxide dissolved in oleum and not in water directly?

Because when mixed with water, sulfur trioxide causes the formation of thick fog comprising of sulfuric acid that is hard to condense. Explanation: Sulfur trioxide is never dissolved directly in the water but rather through the contact process. The key reason is that is highly exothermic in nature.

How is H2SO4 produced by contact process?

Manufacture of H2SO4 by contact process involves three steps:

  1. Burning of sulphur in air to generate SO2.
  2. Conversion of SO2 to SO3 by oxidation with air in the presence of V2O5 as catalyst.
  3. Absorption of SO3 in H2SO4 to obtain oleum H2S2O7. A flow diagram for the manufacture of H2SO4 is given below:

How is sulfur dioxide converted into sulfur trioxide?

Sulphur dioxide is first obtained by the burning of the molten sulphur in presence of air. Sulphur dioxide is then converted to sulphur trioxide in presence of vanadium pentoxide catalyst. The sulphur trioxide thus obtained is absorbed in recycling concentrated sulphuric acid in an absorption tower.

Why SO3 obtained during contact process is not directly absorbed in water?

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sulphur trioxide is insoluble in water due to its covalent nature.

How is sulfuric acid produced industrially?

Sulphuric acid is produced from sulphur. Sulphur dioxide is first obtained by the burning of the molten sulphur in presence of air. Sulphur dioxide is then converted to sulphur trioxide in presence of vanadium pentoxide catalyst. Production of sulfuric acid–single absorption process.

What happens when Sulphur trioxide is dissolved in water?

It can react with water to form sulfuric acid. SO3 is also called sulfuric oxide and sulfuric anhydride. It is used in the production of sulfuric acid and other chemicals, and explosives.

Why is SO3 soluble in water?

To form an aqueous solution of sulfuric acid (H2SO4), sulphur trioxide (SO3) dissolves in and reacts with water. The acid anhydride of sulfuric acid is sulphur trioxide, so SO3 + H2O produces H2SO4. …

What is the reaction between SO3 and H2SO4?

SO3 is the acid anhydride of H2SO4 – i.e water & sulphur trioxide react to form sulphuric acid (though the reaction produces a fine acid mist and is difficult to manage) If you add water to oleum (aka “fuming” sulphuric acid or H2S2O7), then you would get H2SO4 in liquid form – that’s a key stage in the industrial production of sulphuric acid.

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How is sulphuric acid formed from oleum?

In this final step of the contact process, dilution of oleum is done by reacting it with water, and as a result, concentrated sulphuric acid is produced (98\% H2SO4).The reaction to form sulphuric acid solution is exothermic with a large K value, therefore if the sulphur trioxide is added to water, an acid mist forms and is difficult to contain.

What happens when you mix oleum and sulfur trioxide?

When sulfur trioxide is added to water, it creates a mist or aerosol of sulfuric acid, which is hard to control. When it is dissolved first in sulfuric acid, the combined liquid is easier to control. Oleum can then be diluted with water (both liquids) to form sulfuric acid.

How is sulphur trioxide formed from concentrated sulphuric acid?

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.