Monday, 4 January 2016

inorganic chemistry - Which hydrogen halides react with group 14 oxides?


$$\ce{6HF +SiO2->H2SiF6 +2H2O}$$


$\ce{HF}$ reacts with $\ce{SiO2}$ to form $\ce{H2SiF6}$.



Do other hydrogen halides like $\ce{HCl}$ and $\ce{HBr}$ react with group 14 oxides in the same way?




Answer




All reactions taken from this site.


First some maths: 4 hydrogen halides can react with 5 Group 14 monoxides and dioxides. So, there should be 40 different chemical reaction combination possible. But not all reactions are feasible.


HF



  1. With $\ce{SiO2}$ (already mentioned)


  2. $$\ce{GeO2 + 4HF → GeF4 + 2H2O}$$




  3. $$\ce{SnO + 2HF ->[333 K] SnF2 + H2O}$$





HCl



  1. $$\ce{GeO2 + 4HCl(g) ->[450-500 C] GeCl4 + 2H2O}$$


$$\ce{GeO2 + 4HCl(l) ->[170-180 C] GeCl4 + 2H2O}$$



  1. $$\ce{SnO + 3HCl → H[SnCl3] + H2O}$$

  2. $$\ce{SnO2 + 6HCl → H2[SnCl6] + 2H2O}$$


  3. $$\ce{PbO + 2HCl → PbCl2 + H2O}$$

  4. $$\ce{PbO2 + 4HCl → PbCl2 + Cl2 + 2H2O}$$


$\ce{HBr}$ and $\ce{HI}$ do not show such type of reaction.


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