The chemical equation of potassium permanganate heating is 2KMnO4 → K2MnO4+MnO2+O2.
Potassium permanganate (KMnO4) is a purple-black crystal, which will decompose when heated. The chemical equation 2KMnO4 → K2MnO4+MnO2+O2 represents the decomposition reaction of potassium permanganate during heating. According to the equation, two potassium permanganate molecules are decomposed to generate potassium permanganate molecule (K2MnO4), manganese dioxide molecule (MnO2) and oxygen molecule (O2).
This reaction is a redox reaction. In the chemical equation, potassium permanganate undergoes an oxidation reaction and is reduced to products of potassium permanganate and manganese dioxide, and oxygen is released at the same time. In the reaction, potassium permanganate is oxidized by losing oxygen atoms. At the same time, the reduction of oxygen atoms leads to the reduction of oxidation state from +7 to +4.
This decomposition reaction takes place at high temperature, usually in laboratory or demonstration. The oxygen produced by potassium permanganate during heating is helpful to the combustion reaction, and is usually used to ignite combustible materials, accelerate combustion or produce special effects such as flame and spark. The reaction process of potassium permanganate heating will also be accompanied by obvious purple fading phenomenon, which is a remarkable feature of potassium permanganate decomposition reaction.
The experiment of thermal decomposition of potassium permanganate is often used in chemistry teaching and demonstration. This reaction can not only show the characteristics of redox reaction, but also observe the formation of products, the release of oxygen and the change of color, which brings visual appeal to the experimental effect.
Properties and application of potassium permanganate
1, oxidant properties: potassium permanganate is a strong oxidant and can react with other substances. In laboratory and industry, potassium permanganate is often used to oxidize organic matter, remove organic matter from wastewater and disinfect.
2. Purple crystal: Potassium permanganate is a purple-black crystal with bright purple color. This characteristic makes potassium permanganate widely used in chemical experiments and demonstrations, and the purple color of solutions and solids can be observed, which brings visual attraction to the experimental results.
3. Disinfectant and bleach: Potassium permanganate is often used as disinfectant and bleach because of its strong oxidation. In water treatment, potassium permanganate can kill microorganisms and organic substances in water, and remove odor and colored substances in sewage.