During the Spring Festival holiday, snack snacks are "essential" for the holiday season. Many food packaging bags will have white "small packets" of desiccant, most people will randomly discard packets. Recently, the news that "boys throw food desiccants into cups and their eyes were blown away" has caught the attention of the Internet. The reporter conducted an experiment and found that the ordinary lime desiccant was placed in water and produced a large amount of sediment, but no violent reaction such as splashing or bursting occurred. Experts said that the boy was "injured" is an example, but high purity, high dose desiccant may be dangerous when it comes to water. Should avoid the use of desiccant packaging damage, water, prevent children from eating accidentally. Visit Easy to damp foods with desiccant Recently, news reports said that an 8-year-old boy put a desiccant in snacks into a cup with water and exploded. Splashes of water splashed into his eyes, causing one blind boy to lose his eyesight. Someone later conducted an experiment and found that the desiccant could indeed explode and splash when it was put into water. Reporters visited the supermarket and saw that many desiccant snacks used desiccants. It includes nuts and seeds, peanuts, seafood instant noodles and other products. The reporter purchased three kinds of foods, including packed seeds, walnuts and seaweed. Open the package and you can see that there are desiccant packets in the bag. These packets are printed with the words “Do not disassemble†and “Do not eatâ€. Packets of different sizes can be seen by tearing apart the contents of the packets as granular, some grayish, and some are dark brown. When these desiccants are put into water, will the situation described in the aforementioned report occur, that is, an explosion? The reporter recently came to the Warwick Squadron of the Public Security Fire Brigade in Chaoyang District, asking a professional firefighter to conduct an experiment. experiment Experimental Materials: Three packs of desiccant, labeled A, B, C; clean water at room temperature, two transparent plastic bottles, pot Experimental steps: 1. Open the package of Desiccant A, pour the contents into a plastic bottle filled with half a bottle of water, and quickly tighten the cap to observe the reaction. 2. Open the package of Desiccant B and pour the contents into a pot filled with some water and observe the reaction. 3. Open the package of Desiccant C and pour the contents into the same plastic bottle (same as water) from Step 1 and quickly tighten the cap to observe the reaction. Experimental phenomena: The contents of the 1.A package are white particles. After pouring into the water, a reaction occurs. No bubbles are observed. The water near the bottom of the bottle gradually becomes cloudy. There is no sign of obvious heating near the bottle. As the reaction progresses, A lot of white matter sinks to the bottom of the bottle. 2. The content of the package B is similar to that of A. It is also a white particulate matter. After being put into the pot, white turbid substances appear in the pot bottom water, and there is no obvious air bubbles. 3. The contents of the C package are black particles that, after being poured into water, are partially decomposed into black powder that does not react significantly with water. Experimental results: After the desiccant was opened and put into water, no strong reaction occurred and no explosion occurred. Chemical Equation: CaO H2O=Ca(OH)2 The interpretation of the ingredients is mostly lime reaction to water What happened to the water content of the desiccant? The reporter interviewed Professor Liu Shaowei, Department of Food Science and Engineering, School of Biological Engineering, East China University of Science and Technology. Professor Liu said that, in general, desiccant is a chemical agent with strong adsorption capacity, such as fully exposed to the air (relative humidity 80% -90%, temperature 25 °C) 7 hours can absorb 35% -39% Moisture. Adsorption of desiccant is divided into physical adsorption and chemical adsorption. Chemical adsorption desiccants include desiccants in common food packages. The quicklime (CaO) desiccant is widely used. From the experimental point of view, the ingredients of A and B are quicklime. In the incident in which the boy’s eyes were wounded in the aforementioned report, the composition of the desiccant should also be quicklime. "There have been similar cases in the past, but the lime does not explode in water itself," said Professor Liu. According to chemical principles, quicklime (CaO) reacts with water to form calcium hydroxide (ie, hydrated lime) and release at the same time. A lot of heat. Calcium hydroxide (slaked lime) is slightly soluble in water, so the precipitate in the experiment is calcium hydroxide that is not soluble in water. If the reaction takes place inside a closed container, a large amount of heat is generated and the gas expands by heat, which may cause the container to be deformed or even broken. In the case of the aforementioned report, the cup is not a closed container, but it is likely that the desiccant composition is relatively pure, the chemical reaction is strong, and a large amount of heat is emitted, so that the desiccant component splashes into the eyes of children and the quick lime is strongly corrosive. , great harm to the eyes. Why didn't the reporter's experiment have a strong reaction? Liu Shaowei thinks that it may be because there is a small dose of a small packet of desiccant that is not enough to generate enough heat to make the gas in the bottle drastically expand. At the same time, the desiccant component is in the form of granules, not powdery, which proves that the purity is not very high. The desiccant only has a function in a closed environment. After the food package is disassembled, the water in the air enters through the vent hole of the desiccant packet. When poured into the bottle, the desiccant has been exposed to the air for a while, so the reaction will not be so severe. remind Prevent damage to packaging and water, prevent children from accidentally removing During the visit, the reporter discovered that many consumers are throwing desiccant packets into the trash after random consumption of food and will not do more. According to Liu Shaowei, in general, food producers and desiccant manufacturers are separate, and desiccants produced by companies with legal procedures are generally not problematic. With the improvement of the production process, the production of desiccant is also constantly improving. The desiccant produced by regular manufacturers will have warning signs such as “Do not eat†on the packaging. Food desiccants play an important role in preventing food from deteriorating moisture and prolonging the shelf life of foods. Even if they are accidentally opened or have potential safety hazards, they are safe as long as they are not damaged or water. Although there is a low possibility of “explosion†as in the aforementioned news, parents can purchase foods with a desiccant, especially a lime desiccant, in the bag, and they can be disposed of as normal waste if they are not damaged. . At the same time, parents should always educate their children not to use desiccants as “toys,†avoid exposure to desiccant ingredients, and prevent children from accidentally opening packages and even eating. In the event that the desiccant package is broken, accidentally splash the contents into the eyes. Rinse from the side of the nose to the ear with plenty of water as soon as possible. Rinse for at least 15 minutes. In the event of a child being wrongly taken, they should be immediately taken orally diluted with milk or water. Do not induce vomiting so as not to cause more burns.
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