2NaBr+3H2SO4+MnO2 ==2NaHSO4+MnSO4+2H2O+Br2↑
或2NaBr+2H2SO4+MnO2== Na2SO4+MnSO4+2H2O+Br2↑
若分步写:2NaBr+H2SO4(浓) ==NaHSO4+HBr↑
(或2NaBr+H2SO4(浓)==Na2SO4+HBr↑)
4HBr+MnO2== MnBr2+2H2O+Br2↑也可冷凝吸收未冷凝的气体
2NaBr+3H2SO4+MnO2 ==2NaHSO4+MnSO4+2H2O+Br2↑
或2NaBr+2H2SO4+MnO2== Na2SO4+MnSO4+2H2O+Br2↑
若分步写:2NaBr+H2SO4(浓) ==NaHSO4+HBr↑
(或2NaBr+H2SO4(浓)==Na2SO4+HBr↑)
4HBr+MnO2== MnBr2+2H2O+Br2↑也可冷凝吸收未冷凝的气体