氢氧化钠溶液与硫酸:
2NaOH+H2SO4=Na2SO4+2H2O
2Na+ + 2OH- + 2H+ +SO42-=2Na+ +SO42- +2H2O
2OH- + 2H+ = 2H2O
OH- + H+ = H2O
锌粒与稀硫酸
Zn+H2SO4=ZnSO4+H2
Zn+2H+ + SO42- =Zn2+ + SO42- + H2
Zn+2H+ =Zn2+ + H2
氧化铜和稀盐酸
CuO+2HCl=CuCl2 + H2O
CuO+2H+ +2Cl-=Cu2+ +2Cl- + H2O
CuO+2H+ =Cu2+ + H2O
