Question

Why do fluoride ions “win” over thiocyanate ions in a solution with iron ions?

Answer 1

(iii) Hydroxides of both of these decompose on heating to give oxides. ... Reason for alkali metals to be sofi is (a) They are less metallic in nature (b) There is ... have high I.E. An atom with atomic number 20 is most likely to combine chemically with ... HZO Alkaline earth metals form dipositive ions instead of unipositive ions ...

Answer 2

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When you mix aqueous iron(III) nitrate and potassium thiocyanate together you get a red solution. Then if you add sodium fluoride, the red colour disappears.

This is basically because the Fe(SCN)2+Fe(SCN)2+ ions are red, but FeF2+FeFX2+ ions are colourless.

Le Chatelier's principle in that, the more iron ions that are stolen by the fluoride, the less Fe(SCN)2+Fe(SCN)2+ ions there will be because they keep dissociating etc.

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