Potassium Permanganate Manufacturer,Supplier and Exporter in India

Potassium Permanganate is an analytical reagent grade oxidising agent, supplied in a 200 g pack with an MSDS. Its deep purple solution loses colour as it reacts with reducing agents, so it acts as its own indicator in redox titrations. School and college labs also use the crystals for diffusion and convection demonstrations, oxygen preparation and Baeyer's test for unsaturation.

Potassium permanganate grade and pack

Practicals that use potassium permanganate

Titration against Mohr's salt. Make up a standard solution of ferrous ammonium sulphate in water containing some dilute sulphuric acid, and pipette a known volume into a conical flask. Run the permanganate in from a burette until one drop leaves a faint pink that stays on swirling. Repeat until the titres agree, then work out the molarity of the permanganate.

Titration against oxalic acid. Pipette standard oxalic acid solution into a flask, add dilute sulphuric acid and warm it. Titrate while the mixture is still hot. The first drops lose their colour slowly, but later ones vanish almost at once because the manganese(II) ions formed speed up the reaction.

Diffusion and convection. Drop one crystal into a glass beaker of still water and watch purple streaks spread with no stirring. For convection, set a crystal against one side of the beaker floor and heat gently under that spot. The coloured water rises above the flame, crosses the top and sinks on the far side.

Baeyer's test. Shake a few drops of dilute alkaline permanganate with the organic sample in a test tube. Loss of the purple colour and a brown precipitate point to a carbon-carbon double or triple bond. Aldehydes and some other easily oxidised compounds also decolourise it, so a positive result is a strong hint rather than proof.

Frequently Asked Questions About the Potassium Permanganate

Why is the titration acidified with dilute sulphuric acid and not hydrochloric acid?

Permanganate needs hydrogen ions to be reduced to the almost colourless manganese(II) ion, and dilute sulphuric acid supplies them without being oxidised itself. Hydrochloric acid is avoided because permanganate oxidises chloride ions to chlorine, which uses up extra titrant and gives a high reading. Nitric acid is avoided because it is an oxidiser itself.

Why is oxalic acid warmed before it is titrated with permanganate?

The reaction with oxalic acid is slow at room temperature, so the first drops stay coloured for a long time. Warming the acidified solution speeds it up. Once manganese(II) ions have formed they catalyse the reaction. Titrations against ferrous ammonium sulphate are done cold, since heat would let air oxidise the iron(II).

Which meniscus do you read on a burette filled with permanganate solution?

Read the upper edge of the liquid. The solution is so dark that the bottom of the curved surface cannot be seen clearly, so the top edge is used for both the first and the final reading. Keep your eye level with the surface to avoid parallax error.

Why does permanganate solution turn brown or leave a deposit when it stands?

Permanganate breaks down slowly in light and when it meets traces of organic matter, forming brown manganese dioxide. Make titration solutions with distilled water, keep them in a stoppered amber bottle away from sunlight, and standardise them against oxalic acid or ferrous ammonium sulphate on the day of use.

Can potassium permanganate be stored beside glycerin or other organic chemicals?

No. It is a strong oxidiser, and in contact with glycerin, alcohols or other organic matter it can catch fire. Keep the closed pack in a cool, dry cupboard set aside for oxidisers, away from organic chemicals and acids, and read the MSDS before first use.

How are permanganate stains removed from glassware and hands?

The brown stain is manganese dioxide. Glassware comes clean with a rinse of acidified oxalic acid or another mild reducing solution, followed by water. Stains on skin fade as the outer layer wears away. Gloves and goggles prevent them, and any splash should be washed off at once with plenty of water.

Reagents and glassware for permanganate titrations

• Potassium Permanganate 500 g
• Ferrous Ammonium sulphate
• Oxalic Acid
• Sulphuric Acid Dilute
• Burette
• Conical Flask

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Last updated: 14 November 2026