1)ZnCl2+K2S=ZnS↓+2KCl
Zn 2+ + 2Cl- + 2K+ + S 2- =ZnS + 2K+ + 2Cl-
Zn 2+ + S 2- =ZnS
2)H2SO4+2NaOH=Na2SO4+2H2O
2H+ + SO4 2- + 2Na+ + 2OH- =2Na+ + SO4 2- + H2O
2H+ + 2OH- =2H2O
H+ + OH- =H2O
1)ZnCl2+K2S=ZnS↓+2KCl
Zn 2+ + 2Cl- + 2K+ + S 2- =ZnS + 2K+ + 2Cl-
Zn 2+ + S 2- =ZnS
2)H2SO4+2NaOH=Na2SO4+2H2O
2H+ + SO4 2- + 2Na+ + 2OH- =2Na+ + SO4 2- + H2O
2H+ + 2OH- =2H2O
H+ + OH- =H2O