Purple colour
The acidified potassium manganate VII (permanganate) solution is purple in color. When it undergoes reduction, its color changes to colorless or pale pink, indicating the formation of manganese(II) ions.
Heating potassium manganate crystals helps to drive off any water of hydration present in the crystal lattice, allowing for the compound to undergo a color change from green to purple, indicating a shift in oxidation state of manganese. This process is often used in experiments to demonstrate the redox properties of potassium manganate.
When potassium manganate VII reacts with iron II sulfate, the purple color of potassium manganate VII will change to a pale pink or colorless solution due to the reduction of MnO4- to Mn2+. The iron II sulfate solution will become a pale green color due to the formation of Fe2+ ions.
Potassium dichromate is orange and when it reacts with ethanol which is a primary alcohol it is going to oxidise it to form aldehyde which is colorless. so the color change is from Orange to Colorless. :)
The color of potassium permanganate does not disappear when excess ethanol is added because ethanol is unable to fully reduce the permanganate ion (MnO4-) to colorless manganese dioxide (MnO2). Ethanol is a weak reducing agent and is not capable of completely reducing the permanganate ion in this reaction. Additionally, the reaction between potassium permanganate and ethanol is not stoichiometric, meaning that there is an excess of one of the reactants, which can also contribute to the color persisting.
When ethanol is mixed with potassium permanganate, the purple color of the potassium permanganate fades. This is because ethanol reduces the potassium permanganate to form manganese dioxide, which is a brown precipitate. As a result, the overall color of the solution changes from purple to brown.
When potassium permanganate reacts with ethanol, it undergoes reduction, resulting in a color change from purple to brown. The purple color of potassium permanganate is due to the permanganate anion (MnO4-) in an alkaline medium, and when it is reduced by ethanol, it forms manganese dioxide (MnO2), which is brown in color.
Usually there is no indicator needed in potassium permanganate titrations as there will be an excess of manganate ions in the conical flask, turning the solution from colourless to pale pink.
When potassium permanganate reacts with ethanol, it releases oxygen. ie, an atom of oxygen thus converting the ethanol to acetic acid. Initially colour disappears because coloured permanganate ions of potassium permanganate are consumed to oxidise ethanol. C 2 H 5 OH (WITH ALKALINE KMnO 4) CH 3 COOH+H 2 O Remember :When excess is added colour does not change because there is no more alcohol left and hence there is no reaction.
When potassium iodide is oxidized, it forms iodine. Potassium iodide loses electrons hence it is oxidized. This reaction can be observed by the change in color of the solution from colorless to brown/yellow due to the formation of iodine.
Potassium is not a change; potassium (K) is a chemical element.
physical change- the composition of the ethanol is not effected