Write the equations for the laboratory preparation of:
Sodium sulphate (Na2SO4 ) using dil. H2SO4 ,
Lead sulphate (PbSO4 ) using dil. H2SO4
2NaOH + H2SO4 (dil) → Na2SO4 + 2H2O
Pb(NO3 )2 + H2SO4 (dil) → PbSO4 + 2HNO3