What is Baeyer's reagent?


Baeyer’s reagent is an alkaline solution of cold potassium permanganate(KMNO4) of violet colour solution. It is a strong oxidizing agent. As this solution interacts with a double bond compound the colour disappears and becomes colourless. Baeyer’s test is essentially an unsaturation test. This test for unsaturation involves adding bromine to a double bond, which results in the fast decolourization of bromine water or bromine dissolved in carbon tetrachloride.

  • Baeyer’s reagent is an alkaline potassium permanganate solution in a very cold dilute solution.
  • It’s a light violet or purple-coloured solution.
  • Baeyer’s reagent is a powerful oxidising reagent that is used to determine if a hydrocarbon has double or triple bonds.
  • As a result, it denotes that hydrocarbon molecules are unsaturated.
  • When a purple colour reagent is introduced to ethylene, it produces a colourless ethane-1,2-diol solution.

Baeyer’s Reagent Preparation

  1. To make a 1 per cent potassium permanganate solution, dissolve 1 gram of solid KMnO4 in 100 mL distilled water.
  2. The stoppered container is filled with 10 grams of anhydrous sodium carbonate (Na2CO3), which is shaken until entirely dissolved.
  3. When not in use, store the solution in a dark, cold cabinet to keep it fresh.

Properties of KMNO4

Few properties of KNMO4 are,

  • It dissolves in water to give intensely pink or purple solutions.
  • On evaporation, it leaves prismatic purplish-black glistening crystals.

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