Question

With k4fe(cn)6 cu2+ ions give which coloured precipitate

Answer 1

When Potassium ferrocyanide ($K_4Fe(CN)_6$) is treated with copper ions ($Cu^{2+})$ it leads to formation of chocolate colored precipitate.

• The compound called potassium ferrocyanide with chemical formula $K_4Fe(CN)_6$ is used to detect the presence of $Cu^{2+}$ ions and $Fe^{3+}$ ions.
• When a compound containing $Cu^{2+}$ is treated with potassium ferrocyanide, it gives a chocolate-colored precipitate due to the formation of a new compound called copper ferrocyanide.
• The potassium present in the potassium ferrocyanide is replaced by copper present in the solution and leads to the formation of copper ferrocyanide.
• The chemical reaction involved is as shown:

$K_4Fe(CN)_6+2Cu^{2+}\rightarrow Cu_2[Fe(CN)_6] + 4 k^+$.

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