Question

An old bottle of store-brand hydrogen peroxide needs to be analyzed using a redox titration to determine the amount of hydrogen peroxide remaining.
Select the best reagent with correct justification for this task.

• A. Potassium permanganate; the oxidized and reduced forms are different colors at the equivalence point.
• B. Potassium permanganate; the oxidized and reduced forms are different colors at different pH point.
• C. Potassium dichromate; it will form a colored precipitate at the equivalence point.
• D. Potassium dichromate; it will make the hydrogen peroxide change colors at the equivalence point.

Answer 1

The correct option is A Potassium permanganate; the oxidized and reduced forms are different colors at the equivalence point.

$H_2{O}_2$ needs to be analyzed using redox reaction.

reagent - potassium permanganate ${KMnO}_4$ the oxidized and reduced forms are different colours at the equivalance points.

${5H}_2{O}_2+2{KMnO}_4+3H_2{SO}_4\to 5O_2+{2MnSO}_4+8H_{2}O+K_2{SO}_4$