NaCl+H2SO4=微热=NaHSO4+HCl↑
2NaCl+H2SO4=强热=Na2SO4+2HCl↑
NaNO3+H2SO4=微热=NaHSO4+HNO3↑
2NaNO3+H2SO4=强热=Na2SO4+2HNO3↑
不挥发性酸制挥发性酸.