The reaction of cyanide with thiosulfate has prepared the thiocyanate ion which,

Question

The reaction of cyanide with thiosulfate has prepared the thiocyanate ion which, when in acidic solution, bonds to the iron ions in iron(III) nitrate to form a deep red solution. Describe the resulting two-step procedure, including all reagents.

Step 1) Add (acid / thiosulfate and iron (III) nitrate / iron(III) nitrate / thiosulfate compound / acid and iron(III) / thiosulfate compound and acid) to the cyanide sample.

Step 2) Add (thiosulfate and iron(III) nitrate / thiosulfate compound / acid / iorn(III) nitrate / thiosuldate compount and acid / acid and iron(III) nitrate) to the sample.

Explanation / Answer

Step 1 :

S2O3^2- + CN- -----> SCN^-

Step 2 :

SCN- + Fe(NO3)3 ----> Fe(SCN)2^+

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