Potassium cyanide is made alkaline with NaOH | vedclass

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Question

(B) The reaction of potassium cyanide with sodium hydroxide gives the cyanide ion. After that,the cyanide ion reacts with thiosulphate ions. Upon cool

Vedclass · Accepted Answer

Blood red colour solution

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(B) The reaction of potassium cyanide with sodium hydroxide gives the cyanide ion. After that,the cyanide ion reacts with thiosulphate ions. Upon cooling and acidifying with hydrochloric acid,it forms the thiocyanate ion.$KCN + NaOH \rightarrow NaCN + KOH$$S_2O_3^{2-} + CN^{-} \xrightarrow{HCl} SCN^{-} + SO_3^{2-}$The thiocyanate ion reacts with iron $(III)$ chloride to form the complex $[Fe(SCN)]^{2+}$,which has a blood-red colour.$Fe^{3+} + SCN^{-} \rightarrow [Fe(SCN)]^{2+}$ (blood-red colour)Therefore,the solution produces a blood-red colour solution.

Potassium cyanide is made alkaline with $NaOH$ and boiled with thiosulphate ions. The solution is cooled and acidified with $HCl$ and this solution with iron $(III)$ chloride produces :-

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