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Question

Choosing only substances from the list given in the box below , write equations for the reactions which you would use in the laboratory to obtain : 

Dilute sulphuric acid.        Copper         Copper carbonate
                                              Iron              Sodium carbonate
                                             Sodium
                                              Zinc

(a) Sodium sulphate
(b) Copper sulphate 
(c) Iron (II) sulphate
(d) Zinc carbonate 


Solution

(b) copper sulphate

Copper does not react with dilute sulphuric acid as its reduction potential is higher than that of hydrogen. Copper does not displace hydrogen from non-oxidising acids like HCl or dilute H2SO4.

But, concentrated sulphuric acid is an oxidising agent. So, when copper is heated with conc.H2SO4, a redox reaction occurs and the acid gets reduced to sulphur dioxide.

                          Cu + 2H2SO4 = CuSO4 + SO2 + 2H2O


CuC03 + H2SO4 -> CuSO4 + H20 + CO2

(a) Sodium Sulphate

You don't want to be there when that reaction starts, it's extremely violent.
 2 Na +  H2SO4  =  Na2SO4 + H2
Sodium sulphate and hydrogen gas are the reaction products.

Na2CO3 + H2SO4 -> Na2SO4 + H2O + CO2

(c) Iron(II) Sulphate
 

There are two potential reactions that can take place - with dilute H2SO4, you get a standard metal-acid redox reaction - Iron (II) Sulphate & hydrogen gas are the products:

Fe (s) + H2SO4 (aq) → FeSO4 (aq) + H2 (g)

In hot concentrated solutions, the acid acts as an oxidising agent, the redox reaction producing iron (III) sulphate, water and sulphur dioxide gas

2Fe (s) + 6H2SO4 (l) → Fe2(SO4)3 (aq) + 3SO2 (g) + 6H2O (l)

(d) Zinc Carbonate

Zinc carbonate is not formed from the above given compounds
it is formed by this reaction

ZnSO4(aq) + Na2CO3(aq) → Na2SO4(aq) + ZnCO3(s)


Chemistry

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