1.NaNO2 + HCl = NaCl + HNO2
Na+ + NO2− + H+ + Cl− = Na+ + Cl− + HNO2
NO2− + H+ = HNO2
2.2HCl + CuSO4 = H2SO4 + CuCl2
4.Na2SO3 + 2H2SO4 = 2NaHSO4 + SO2↑ + H2O
2Na+ + SO32− + 4H+ + 2SO42− = 2Na+ + 2HSO4− + SO2↑ + H2O
SO32− + 4H+ + 2SO42− = 2HSO4− + SO2↑ + H2O
5.2KOH + H2SO4= K2SO4 + 2H2O
2K+ + 2OH− + 2H+ + SO42− = 2K+ + SO42− + 2H2O
2OH− + 2H+ = 2H2O
6.2Al(OH)3↓ + 3H2SO4=Al2(SO4)3 + 6H2O
2Al(OH)3↓ + 6H+ + 3SO42-=2Al3+ + 3SO42− + 6H2O
2Al(OH)3↓ + 6H+=2Al3+ + 6H2O
1.NaNO2 + HCl = NaCl + HNO2
Na+ + NO2− + H+ + Cl− = Na+ + Cl− + HNO2
NO2− + H+ = HNO2
2.2HCl + CuSO4 = H2SO4 + CuCl2
4.Na2SO3 + 2H2SO4 = 2NaHSO4 + SO2↑ + H2O
2Na+ + SO32− + 4H+ + 2SO42− = 2Na+ + 2HSO4− + SO2↑ + H2O
SO32− + 4H+ + 2SO42− = 2HSO4− + SO2↑ + H2O
5.2KOH + H2SO4= K2SO4 + 2H2O
2K+ + 2OH− + 2H+ + SO42− = 2K+ + SO42− + 2H2O
2OH− + 2H+ = 2H2O
6.2Al(OH)3↓ + 3H2SO4=Al2(SO4)3 + 6H2O
2Al(OH)3↓ + 6H+ + 3SO42-=2Al3+ + 3SO42− + 6H2O
2Al(OH)3↓ + 6H+=2Al3+ + 6H2O