Why is there a layer of white powder on tap water after it is boiled?

About scale: What is scale? Scale is a mixture of water-insoluble compound precipitation and impurities. After consulting, calcium and magnesium ion compounds (such as calcium carbonate and calcium chloride) are mostly insoluble in water, while sodium compounds (such as sodium carbonate and sodium chloride) are mostly soluble in water. This is the basic principle of water softener. The main component of scale is calcium carbonate, which has no effect on health, but it will affect the kettle. It can be removed with vinegar. When the aluminum pot is boiling water, put a spoonful of baking soda and boil for a few minutes, and the scale will be removed. Vinegar descaling If the kettle has scale, you can put a few spoonfuls of vinegar in the water and boil it to remove scale. The mask prevents scale accumulation. Put a clean mask in the kettle. When boiling water, the scale will be absorbed by the mask. A pot for boiling egg water is difficult to remove after a long time. In this regard, you can use it to cook eggs twice, which will have ideal results. After potato skins are used in aluminum pot or aluminum pot for a period of time, there will be a thin layer of scale. Put the potato skin in, add some water to boil, and take it out for about 10 minutes. Scale removal by heat expansion and cold contraction Put an empty kettle on the stove and let the water in the scale dry. When you see a crack in the bottom of the kettle or a bang, remove the kettle and quickly inject cold water, or wrap the handle and spout with a rag, hold it with both hands, and quickly sit the dried kettle in cold water (don't let water inject into the kettle). The above two methods must be repeated for 2-3 times, and the scale at the bottom of the pot will fall off due to thermal expansion and cold contraction. Boil the sweet potato in a kettle to prevent water scale. Put the sweet potato in a new kettle for more than half a pot, fill it with water, cook the sweet potato, and then boil the water later, so that scale will not accumulate. Don't scrub the inner wall of the kettle after the sweet potato is cooked, otherwise it will lose its anti-scaling effect. For the old kettle with scale, after the sweet potato is boiled 1-2 times by the above method, not only the original scale will gradually fall off, but also the scale can be prevented from accumulating again. Magnet descaling put a magnet in the kettle. When boiling water, the thick scale at the bottom of the kettle will crack by itself, and it is easy to take out the scale block. Skillfully removing scale: If the kettle is used for a long time, there will be a layer of white scale in the kettle, which is not easy to clean. Before going to bed at night, you can try to fill a pot of strong brine and vinegar, and wait until the next morning, with a little steel brush and a little detergent brush, the scale will easily fall off. (1) Boil yam in a kettle to remove scale. In a new kettle, put more than half a pot of yam, fill it with water, cook the yam, and then boil the water later, so it won't accumulate scale. However, it should be noted that do not scrub the inner wall of the kettle after cooking the sweet potato, otherwise it will lose the descaling effect. For the old kettle that has been covered with scale, after being boiled once or twice by the above method, not only the original scale will gradually fall off, but also it can prevent the scale from accumulating again. (2) Baking soda descaling When boiling water in an aluminum pot with scale, add 1 teaspoon baking soda and boil for a few minutes, and the scale will be removed. 3 Boil the eggs and scale the boiling pot. After a long time, it will be difficult to scale. If you use it to boil eggs twice, you will get the ideal effect. (4) Scale removal of potato skin After being used in aluminum pot or aluminum pot for a period of time, there will be a thin layer of scale. Put the potato skin into it, add appropriate amount of water, boil it, and take it out for about 10 minutes. ⑤ Thermal expansion and cold contraction remove scale. Put the empty kettle on the stove to dry the water in the scale. When the bottom of the kettle cracks or bursts, take it off and quickly inject cold water, or wrap the handle and spout with a rag, hold it with both hands, and quickly sit the dried kettle in the cold water (don't let water inject into the kettle). Repeat for 2 to 3 times, and the scale at the bottom of the pot will fall off due to thermal expansion and cold contraction. 6 vinegar descaling If the kettle has scale, you can put a few even vinegar in the water and burn it for an hour or two, and the scale will be removed. If the main component of the scale is calcium sulfate, the soda solution can be poured into the kettle for cooking to remove the scale. ⑦ Mask In order to prevent scaling, put a clean mask in the kettle. When boiling water, the scale will be absorbed by the mask. ⑧ Magnetization Put a magnet in the pot, which not only does not scale, but also magnetizes boiled water, and has the function of preventing constipation and pharyngitis.