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Question
Sulphuric acid is manufactured by the contact process.
Name the chemical used to dissolve SO3 and also name the product formed. Give all the main reactions to this process.
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Solution
The chemical used to dissolve SO3 is concentrated sulphuric acid. The product formed is the oleum or pyrosulphuric acid.
\[\ce{SO3 + H2SO4 -> H2S2O7}\]
Main reactions of the process are:
\[\ce{S + O2 -> SO2}\]
\[\ce{4FeS2 + 11O2 -> 2Fe2O3 + 8SO2}\]
\[\ce{2SO2 + O2 <=>[V2O5][450^\circ C] 2SO3}\]
\[\ce{SO3 + H2SO4 -> H2S2O7}\]
\[\ce{H2S2O7 + H2O -> 2H2SO4}\]
RELATED QUESTIONS
Give reasons for the following:
Sulphuric acid forms two types of salts with NaOH.
Write a balanced chemical equation for each of the following reactions :
Action of dilute sulphuric acid on sodium hydroxide.
Distinguish between the following pairs of compounds using the reagent given in the bracket.
Ferrous sulphate solution and ferric sulphate solution. (Using sodium hydroxide solution)
Give reason for the following:
Concentrated sulphuric acid must be stored in airtight bottles.
Give examples of the use of sulphuric acid as
An electrolyte in everyday use
HCl, HNO3 and H2SO4 are formulae of three compounds. Which of these compounds has the highest boiling point and which has the lowest?
Name the following:
A sulphate insoluble in water.
Sulphuric acid is manufactured by the contact process.
Why H2SO4 is not obtained by directly reacting SO3 with water?
Some properties of sulphuric acid are listed below. Choose the property A, B, C or D which is responsible for the reactions (i) to (v). Some properties may be repeated:
- Typical acid
- Dehydrating agent
- Non-volatile acid
- Oxidizing agent
- \[\ce{C12H22O11 + nH2SO4 -> 12C + 11H2O + nH2SO4}\]
- \[\ce{S + 2H2SO4 -> 3SO2 + 2H2O}\]
- \[\ce{NaCl + H2SO4 -> NaHSO4 + HCl}\]
- \[\ce{CuO + H2SO4 -> CuSO4 + H2O}\]
- \[\ce{Na2CO3 + H2SO4 -> Na2SO4 + H2O + CO2}\]
Which property of sulphuric acid accounts for its use as a dehydrating agent?
