Chemistry
The preparation of lead sulphate from lead carbonate is a two step process. (lead sulphate cannot be prepared by adding dilute sulphuric acid to lead carbonate.)
(a) What is the first step that is required to prepare lead sulphate from lead carbonate?
(b) Write the equation for the reaction that will take place when this first step is carried out.
(c) Why is the direct addition of dilute sulphuric acid to lead carbonate an impractical method of preparing lead sulphate?
Acids Bases Salts
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Answer
(a) The first step is to convert insoluble lead carbonate into soluble lead nitrate by treating lead carbonate with dilute nitric acid.
(b) PbCO3 (s) + 2HNO3(dil) ⟶ Pb(NO3)2 (aq) + H2O (l) + CO2
(c) Adding dilute sulphuric acid (H2SO4) to lead carbonate (PbCO3) in order to prepare lead sulphate (PbSO4) is an impractical method because an insoluble crust of lead sulphate is formed on lead carbonate which prevents further reaction.
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