怎样制取HF,HCl(气体),HBr,HI?

问题描述:

怎样制取HF,HCl(气体),HBr,HI?

CaF2+H2SO4=CaSO4+2HF↑(铅皿)
制取Hcl,HBr,HI和HF不一样
原理:高沸点酸制取低沸点酸(或加热挥发)
药品:固体可溶性卤盐固体+浓硫酸(浓磷酸)
NaCl(s)+H2SO4(浓)=NaHSO4+HCl↑(微热)
NaCl(s)+NaHSO4= Na2SO4+HCl↑(强热)
NaCl(s)+H2SO4(浓)=Na2SO4+2HCl↑(强热)
NaBr(s)+H2SO4(浓)=NaHSO4+HBr↑(微热)
NaBr(s)+H3PO4(浓)=NaH2PO4+HBr↑(Δ)
NaI(s)+H3PO4(浓)=NaH2PO4+HI↑(Δ)