  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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