Can expired potassium permanganate work? Can potassium permanganate still be used after it expires?

Potassium permanganate. It generally does not expire, but it is not very stable and will be reduced to oxygen and other properties in the air.

The substance reacts. So it's best not to leave it for too long.

If the storage conditions are good, KMNO4 will always be effective, but if it is not stored properly, it will become invalid when it encounters some reducing substances or is heated, which is what you call expired drugs can not be used, and the same is true for external drugs.

Potassium permanganate is a commonly used disinfectant, also known as "PP powder", which is often used as an aqueous solution. Potassium permanganate is a strong oxidizing agent.

It should be sealed and moisture-proof when stored. Improper storage of potassium permanganate or beyond a certain storage period will reduce the effect, and even decomposition failure, for the sake of prudence, so please do not use expired potassium permanganate!

FYI!

Potassium permanganate does not expire.

Potassium permanganate (KMno4, mr=, inorganic compound, dark purple elongated orthorhombic columnar crystal, metallic luster. Orthorhombic crystal system. It was discovered by Westerners in 1659. Chinese common name: gray manganese oxygen.

In the production of chemicals, it is widely used as an oxidant, such as an oxidant for saccharin, vitamin C, isoniazid and benzoic acid; used as preservative, disinfectant, deodorant and antidote in medicine; In water purification and wastewater treatment, it is used as a water treatment agent to oxidize hydrogen sulfide, phenol, iron, manganese and organic, inorganic and other pollutants to control odor and decolorization; In gas purification, trace sulfur, arsenic, phosphorus, silane, borane and sulfide can be removed; In mining metallurgy, oxidants for the separation of molybdenum from copper, the removal of impurities from zinc and cadmium, and the flotation of compounds; It is also used as a bleaching agent for special fabrics, waxes, greases and resins, an adsorbent for gas masks, and a colorant for wood and copper.

Theoretically, no.

As long as you store it properly, it is not pyrolyzed and does not come into contact with the reducing agent. Then it can always maintain its original performance indicators.

But if you are in a business, the customer does not think so, because the storage cannot reach a perfect state, you can't buy a bottle of reagent, and if you don't use it, it may deteriorate if you come into contact with the outside world.

Generally, the label on the bottle has an expiration date. And the expiration date is not necessarily OK. If it is not used properly, it will also deteriorate and fail.

1. Expired potassium permanganate can still be used.

Potassium permanganate is a chemical substance, with strong oxidation, and oxygen in the air will not react, if stored properly, even if it expires, it will not change the composition, the efficacy will not be weakened, you can use it with confidence, if there is moisture in, it will still not produce toxic ingredients, the efficacy has decreased, and it can also be used.

2. The efficacy of expired potassium permanganate is affected by the method of preservation, if the air is isolated in the preserved environment, its composition will not change after expiration, it is still potassium permanganate, and the effect is still the same as normal new products; If the storage environment is humid, the air isolation is not very good, and the infiltration of moisture will lead to the loss of oxygen active substances in it, and the efficacy will be reduced.

3. The expired potassium permanganate does not have any ***, at most potassium permanganate is converted into manganese dioxide, its color is deepened a lot, the dissolved water is dark, and the oxidation effect is weakened, but there will be no additional toxicity to the human body.

4. The shelf life of potassium permanganate is 2 years.

Potassium permanganate is a chemical, if the storage environment is better, there is no shelf life, and potassium permanganate in ordinary life is not very well stored after opening, so it has a shelf life of 1 2 years.

If potassium permanganate expires, there is no invalidity.

1. Potassium permanganate (chemical formula: kmno), strong oxidant, purple-red crystal, soluble in water, reduced in ethanol. It is commonly used as disinfectant, water purification agent, oxidant, bleaching agent, toxic gas absorber, carbon dioxide essence preparation, etc.

It was discovered by Westerners in 1659. It is used for cleaning and disinfection and fungal eradication.

2. Physical properties.

Potassium permanganate structure.

Potassium permanganate structure.

Appearance and properties: dark purple slender orthorhombic columnar crystals, with metallic luster.

Relative density (water = 1).

Solubility: soluble in water, lye, slightly soluble in methanol, acetone, sulfuric acid.

3. Closed operation and strengthened ventilation. Operators must be specially trained and strictly follow operating procedures. It is recommended that the operator wear a hood-type electric air purifying dust respirator, wear a rubber cloth gas suit, and wear neoprene gloves.

Keep away from fire and heat sources, and smoking is strictly prohibited in the workplace. Avoid dust generation. Avoid contact with reducing agents and active metal powders.

When handling, it is necessary to load and unload lightly to prevent damage to the packaging and containers. Equipped with corresponding varieties and quantities of fire-fighting equipment and leakage emergency treatment equipment. Empty containers may leave harmful substances behind.

Potassium permanganate is a strong oxidant, and expired potassium permanganate may have weakened oxidation and sterilization!

Potassium permanganate generally does not expire, but it is not very stable, it is highly oxidizing and reacts with oxygen and other reducing substances in the air. So it's best not to leave it for too long. If it is not stored properly, it will reduce the effect when encountering some reducing substances or heat, and even decompose and fail, for the sake of prudence, please do not use expired potassium permanganate!

It works, but it doesn't work as good as it used to be.

The shelf life is generally two years. It can generally be used without moisture.

It's best not to use expired medicines, just buy a bottle again, after all, it's not expensive, and the loss is greater if there is a problem.

Potassium permanganate cannot be used when it expires.

As long as it is well preserved, it generally does not expire, and these are all chemicals.