1)Zn + 2HCl = ZnCl2 + H2Zn + 2H(+) + 2Cl(-) = Zn(2+) + 2Cl- + H2Zn + 2H(+) = Zn(2+) +H22)Ca(OH)2 + 2HCl(разб.) = CaCl2 + 2H2OCa2+ + 2OH− + 2H+ + 2Cl− = Ca2+ + 2Cl− + 2H2O 2OH− + 2H+ = 2H2O3)2HCl+MgO=MgCl2+H2OMgO + 2H+ + 2Cl- = Mg2++ 2Cl- + H2OMgO + 2H+ = Mg2+ + H2O4)BaS+2HCl=BaCl2+H2S