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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