The presence of dangerous peroxides in an ether sample can be tested in the laboratory. Addition of — Alcohols Phenols and Ethers Chemistry Question
Question
The presence of dangerous peroxides in an ether sample can be tested in the laboratory. Addition of an aqueous solution of ferrous ammonium sulfate ($Fe^{2+}$) followed by potassium thiocyanate ($KSCN$) yields a specific observation if peroxides are present. What is it?
Answer: B
💡 Solution & Explanation
Peroxides act as oxidizing agents, oxidizing the $Fe^{2+}$ ions to $Fe^{3+}$ ions. The newly formed $Fe^{3+}$ ions immediately react with the added thiocyanate ions ($SCN^-$) to form a blood-red coordination complex, $[Fe(SCN)_n]^{(3-n)+}$.
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