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Question

From the list of the substances given, name the substances which you would use to prepare each of the following salts:
List of substances: copper, lead, sodium, zinc, copper oxide, lead carbonate, sodium carbonate solution, dilute hydrochloric acid, dilute nitric acid and dilute sulphuric acid.
Salts: (a) zinc sulphate (b) copper sulphate (c) sodium sulphate (d) lead sulphate.


Solution

(a) Zinc sulphate is prepared by displacement reaction between zinc and dilute sulphuric acid.

              Zn   +    dil. H2SO4     ZnSO4   +  H2

(b) Copper sulphate is prepared by the neutralisation reaction of copper oxide with dilute sulphuric acid.
 
              CuO  +    dil. H2SO4  CuSO4  + H2O

(c) Sodium sulphate is prepared by the neutralisation of soluble base i.e. sodium carbonate with dilute sulphuric acid.

                 Na2CO3 +dil.H2SO4   Na2SO4 + H2O +CO2    

(d) Lead sulphate: Preparation of lead sulphate from lead carbonate involves the following steps:

Step 1: Insoluble lead carbonate first reacts with dilute nitric acid to form soluble lead nitrate. 

                PbCO3 + 2HNO3 Pb(NO3)2 + H2O + CO2 

Step 2: Dilute sulphuric acid is added to lead nitrate to form lead sulphate and nitric acid.

               Pb(NO3)2  + dil. H2SO4   PbSO4  + 2HNO3  

Chemistry
Frank Chemistry - II
Standard X

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