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Uses of Nitric Acid

In contact pr...

Question

In contact process why SO3 is not directly converted to H2SO4 instead there are two more steps to convert it

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Solution

SO3 dissolution in water is extremely exothermic. This forces the sulfuric acid to form a mist of tiny droplets. These are highly corrosive which can even attack and corrode the lead pipelines and linings which cover the tower in contact process. Also, this mist does not condense so easily. So, sulfur trioxide is dissolved in concentrated sulfuric acid to produce oleum/ pyrosulfuric acid (H2S2O7. equialent to sulfuric acid content of about 110% )which can be diluted with a required amount of water (in a much less exothermic pathway) to yield con (98%) sulfuric acid.

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Q. In the preparation of

H_{2} S O_{4}

by Contact Process, why is

S O_{3}

not absorbed directly in water to form

H_{2} S O_{4}

Q. In the Contact process, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead a two-step procedure is used. The equations for the two steps involved are:

{S O}_{x} + H_{2} {S O}_{4} \to H_{2} S_{2} O_{y} H_{2} S_{2} O_{7} + H_{2} O \to 2 H_{2} {S O}_{4}

Find the value of x and y :

Q. Write balanced chemical equations to show how

S O_{3}

is converted to Sulphuric acid at the contact process.

Q. (a) Name the catalyst which helps in the conversion of sulphur dioxide to sulphur trioxide in step C.
(b) In the Contact process for the manufacture of the sulphuric acid, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead, a two-steps procedure is used. Write the equations for the two steps involved in D.
(c) What type of substance will liberate sulphur dioxide from sodium sulphite to step E?
(d) Write the equation for the reaction by which sulphur dioxide is converted to sodium sulphite in step F.
[5 MARKS]

Q. Sulphuric acid is manufactured by the Contact process.
(a) Give two balanced equations to obtain

S O_{2}

in this process.
(b) Give the conditions for the oxidation of

S O_{2}

H_{2} S O_{4}

not obtained by directly reacting

S O_{3}

with water?
(d) Name the chemical used to dissolve

S O_{3}

and name also the product formed.
(e) Give all the main reactions to this process.
[5 MARKS]

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