1.NaF+HCl===NaCl+HF H+ +F-===HF
2.Na2S+H2SO4===H2S+Na2SO4 S2- +2H+===H2S
3.HI+NaOH===NaI+H2O H+ +OH-===H2O
4.NaHSO3+KOH===NaKSO3+H2O HSO3- +OH-===SO3 2- +H2O
5.NaBr+AgNO3===AgBr+NaNO3 Ag+ +Br-===AgBr
6.NaHSO3+H2SO4===NaHSO4+H2O +SO2 HSO3- + H+===H2O+SO2
H2SO3===H+ +HSO3- HSO3-===H+ +SO3 2-
H3PO4===H+ +H2PO4- H2PO4-===HPO42- +H+ HPO42-===PO4 3- + H+
Mg(OH)2===Mg2+ +2OH-
NaHS===Na+ +HS- HS-===H+ + S2-
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