Question

preparation of H2SO4 by contact process​

Answer 1

Explanation:

We will first start by addressing the question of what is sulphuric acid. Well, sulphuric acid is basically an oxidizing agent, a strong mineral acid, and a dehydrating agent. Sulphuric acid has the chemical formula H2SO4.

The acid is a colorless liquid. It is soluble in water and generally releases heat on contact. Further, the acid is corrosive in nature to metals and tissues. It will even char wood and most other organic matter on contact, but chances of objects catching fire are null. The acid has a density of 15 lb/gal. Exposure to the acid can result in adverse health effects from inhalation. It depends on the rate of exposure and concentration.

Answer 2

Sulphuric acid is manufactured by the contact process. It involves the following steps:

Step(i):

Sulphur or sulphide ores are burnt in air to form SO2.

 

Step(ii):

By a reaction with oxygen, SO2 is converted into SO3 in the presence of V2O5 as a catalyst.

 

Step (iii):

SO3 produced is absorbed on H2SO4 to give H2S2O7 (oleum).

Step (iv):

This oleum is then diluted to obtain H2SO4 of the desired concentration.

In practice, the plant is operated at 2 bar (pressure) and 720 K (temperature). The sulphuric acid thus obtained is 96-98% pure.

Refer the image attached for Balanced Chemical Equations:

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