<span>а)</span><span> 2Na+ + 2OH− + 2H+ + SO42− = 2Na+ + SO42− + 2H2O </span>2OH− + 2H+ = 2H2O б)<span> Cu(OH)2 + 2HCl(разб.) = CuCl2 + 2H2O </span><span> CU(2+)+2OH(-)+2H(+)+2CL(-)=CU(2+)+2CL(-)+2H2O </span><span> 2OH(+)+2H(+)=2H2Oв) <span>FeSO4 + Ba(NO3)2 = Fe (NO3)2 + BaSO4 (осадок) </span><span>Fe (2+) + SO4 (2-) + Ba (2+) + 2NO3 (-) = Fe (2+) + 2NO3 (-) + BaSO4 </span><span>Ba(2+) + SO4 (2-) = BaSO4</span>д)<span>MgCO3 + 2 HNO3 = Mg(NO3)2 + H2O + CO2</span></span>Mg2++CO32-+2H++2NO3- → Mg2++2NO3-+H2O+CO2↑ <span>2H</span>+<span>+CO</span>32-<span> → H</span>2<span>O+CO</span>2<span>↑</span>
BaCl2 + H2SO4 = BaSO4 + 2HCl