Formic acid has reducing properties and can cause acidic potassium permanganate solutions to fade; However, acetic acid does not have reducing properties and cannot fade acidic potassium permanganate solutions. This property can be used to distinguish them from acetic acid.
Both formic acid and oxalic acid have reducing properties and can cause acidic potassium permanganate solutions to fade.
However, acetic acid does not have reducing properties and cannot cause the acidic potassium permanganate solution to fade. This property can be used to distinguish them from acetic acid.
Formic acid has an aldehyde structure and can react with silver ammonia solution, exhibiting a silver mirror phenomenon. It can be identified using Toren reagent.
Precautions for silver mirror reaction:
1. Acetaldehyde that has been left to precipitate for a long time cannot be used. Because acetaldehyde solution is prone to polymerization reaction after prolonged exposure. React with sulfuric acid at room temperature to produce triacetal; At 0 ¡æ or below, tetraacetaldehyde is synthesized by polymerization. Triacetaldehyde is a slightly soluble liquid, while tetraacetaldehyde is an insoluble solid. The polymerized acetaldehyde no longer has the characteristics of acetaldehyde.
2. The silver ammonia solution used must be prepared as needed and cannot be stored for a long time. Because the solution is left for a long time, a black explosive substance, silver nitride precipitate, will precipitate. Even if scraped with a glass rod, this substance will explode due to its decomposition. This precipitate can also undergo violent explosions when subjected to vibration during drying.
3. When conducting experiments on the silver mirror reaction, the concentration of silver nitrate solution should not be too small, and the appropriate mass fraction of silver nitrate is 2% to 4%.
Acetic acid, also known as acetic acid, is a common organic acid widely used in daily life and production. The vinegar used in our household, although divided into brewed vinegar and synthetic vinegar according to different production methods, its main component is still acetic acid. Similarly, acetic acid is added as a seasoning to some tomato sauce, blueberry sauce, and various types of jam in supermarkets. It can be seen that we often consume acetic acid in our daily diet. So, is acetic acid harmful to the human body? In fact, the impact is not very significant, as long as the intake is controlled, there will be no major problems. Although excessive consumption of vinegar can lead to excessive secretion of gastric acid, it may corrode the stomach wall and cause the occurrence of stomach diseases. But as long as the degree is well controlled, vinegar still has a good regulatory effect on the human body. Vinegar can stimulate the secretion of saliva and stomach acid, promote digestion, and increase people's appetite. They have protective effects on the skin and hair, as recorded in ancient Chinese medical books. Acetic acid not only has edible value as a flavor enhancer and fragrance enhancer, but also has medicinal value. Acetic acid has a bactericidal effect, and some bacterial diseases such as foot moss and hand moss can be alleviated by soaking in acetic acid. Moreover, acetic acid also has a cosmetic effect, which makes it popular among women.
Acetic acid can be seen everywhere in our lives, which also demonstrates its powerful role. So we should have a correct understanding of the role of acetic acid, whether in daily life or production, its role should not be underestimated. Only in this way can we effectively utilize the role of acetic acid in food and medicine, and realize its true value.
