@chornedsnorkack: I know of no insoluble stable salt of ICl4(-). The only stable ones I know are the potassium, rubudium and cesium salts. The
ammonium salt does not exist, because the ICl4(-) ion is incompatible with ammonium ion. The cesium salt is the least soluble in conc. HCl.
ICl4(-) also is unstable in dilute aqueous solution, it hydrolyses to HIO3, I2 and Cl(-).
An interesting experiment may be to add HIO3 to conc. HCl in which some transition metal salt is dissolved. Many transition metal salts, however, do
not have the free metal ion in solution, but strongly coordinated negatively charged ions, which do not combine with ICl4(-). E.g. copper(II) does not
exist as Cu(2+) in conc. HCl, but as CuCl4(2-). A similar thing is true for nickel, cobalt, iron(III). Many others are oxidized by the ICl4(-), e.g.
iron(II), copper(I), manganese(II), tin(II).
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