Why is fecl2 formed instead of fecl3 when iron reacts with dil hcl?
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It is because in dil. HCl you have low amount of chloride ion, then if you do the thermodynamic calculation of free Gibbs' energy of the process, using the concentration (activity) you will find that the more thermodynamically stable compound is FeCl2. So, FeCl2 is formed instead of FeCl3.
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