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The desiccant of the packaging bag will fry in contact with water

Many food, medicine packaging bags, and even plastic cups often contain a packet of particulate matter, which is commonly referred to as desiccant. But it was this small packet of desiccant that exploded in the cup with water.Dangerous event——Nori Desiccant Injures Teenager’s EyesCCTV once reported that a third-year student put the desiccant in the nori food packaging into a thermos cup, but after a while, the desiccant exploded. The explosion caused the third-year student to bleed from his forehead, his face covered with lime powder, and it was difficult to open his eyes. School doctor according to the desiccant on the outer packaging”If swallowed by mistake, if it gets into eyes, please rinse with water first”instructions, rinse the student with clean water. After a brief cleanup, the student was sent to a local hospital. Doctors tried their best to rescue, but the student’s vision was still affected, and the vision in his left eye changed to0.3, The right eye is basically blind, with only some light perception, can not see what is in front of him.desiccant experimentPour out the lime desiccant in the food packaging bag and find that it is mostly white powder and particulate matter, and emits a choking smell. Put the desiccant in a clear plastic bottle and fill the plastic bottle with water. In less than half a minute, bubbles came out of the water, hot air also floated out from the mouth of the plastic bottle, and the bottle began to heat up. Tighten the cap and the bottle begins to expand.5After a few minutes, I squeezed the plastic bottle with my hand. The bottle body has become relatively hot, and the bottle body has expanded even more. The original granular lime also began to become powdery. About10After a few minutes, it was observed that the bottom of the plastic bottle had been deformed, the body of the plastic bottle had become a little hot, the granular lime had completely turned into powder, and the water in the bottle had become thicker.Experimental interpretationThe desiccant used in the experiment is a lime desiccant, and the main component of lime is calcium oxide. When calcium oxide encounters water, it will produce a sharp chemical reaction and release a lot of heat in an instant. If the amount of lime contained in the plastic bottle is relatively large, the heat generated by the chemical reaction will cause the plastic bottle to expand rapidly, which will seriously cause the plastic bottle to burst. If the amount of lime in the plastic bottle is relatively small, the lime close to the inner wall of the plastic bottle may scald and deform the plastic bottle. When calcium oxide reacts with water, a new substance is formed, which is calcium hydroxide. Calcium hydroxide is alkaline and will also play an auxiliary role in the deformation of the bottle.remind——The desiccant in the food bag should be thrown away in timeThe desiccant placed in the food bag will have clear reminders, but these reminders are often overlooked. After citizens buy back food, if there is desiccant in the packaging bag, especially lime desiccant, it is best to throw it away directly. Because some lime desiccants are not granular but completely powdery, they may be accidentally sprayed into the eyes after disassembly. The desiccants in food are all alkaline chemicals, which are very destructive to the cornea. Once it enters the eye, it will cause burns to the cornea and conjunctiva. If ingested, the desiccant can burn the mouth, make lips and tongue red and swollen, and burn the esophagus and stomach.The editor reminds everyone that if a desiccant is accidentally splashed into the eyes, it should be rinsed from the inside to the outside of the eyes with water or normal saline as soon as possible. When rinsing is inconvenient, you can soak your eyes in water, separate your eyelids with your hands, turn your eyes and shake your head. If you ingest desiccant by mistake, it is best not to induce vomiting, but to drink milk or water immediately, but do not overdose. Also be careful not to use any acids to neutralize, as the heat released by the neutralization reaction can aggravate the damage.

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