deny/refute/spike a rumour
People who often make steamed bread must be familiar with baking soda, which is a necessary hair artifact for families.
Recently, however, on a short video platform, baking soda has become a "online celebrity". In the video, baking soda goes out of the kitchen and does other jobs: removing rust and scale, cleaning the washing machine, draining the sewer, whitening teeth, and removing stains in the toilet … … It can be said that you are proficient in all kinds of martial arts. But is baking soda really so magical?
Can remove rust and scale? The components of the two do not react with alkali at all.
Baking soda, namely sodium bicarbonate, also known as acid sodium carbonate, is an acid salt with the chemical formula of NaHCO3. When it is mixed with water, it is weakly alkaline. It is a crystalline white solid, but usually it is a fine powder with a slightly salty alkaline taste.
For the statement that baking soda can be used to remove scale and urine scale, a professional who asked not to be named told the Science and Technology Daily reporter that the components of scale are calcium carbonate, magnesium carbonate, calcium sulfate, magnesium sulfate, calcium chloride and magnesium chloride; The urine scale on the toilet is some salts, such as carbonate, phosphate, ammonium salt, etc. These components will not react with alkali, and only acid can remove them, so baking soda cannot be used to remove scale and urine scale.
Besides not removing scale and urine scale, it is unscientific to say that baking soda and white vinegar can remove rust. The composition of rust is iron oxide, which does not react with alkali, so baking soda can’t remove rust. Although acetic acid can slowly dissolve rust, the concentration of acetic acid in white vinegar is only 3%— 5%, basically no rust removal effect. Using baking soda and white vinegar to remove rust from scissors will not only blunt scissors, but also accelerate the corrosion of scissors if they are not cleaned cleanly.
Then what is the correct rust removal method? Commonly used rust removal methods can be divided into physical methods and chemical methods. The physical method is mainly to remove rust by grinding, such as grinding with sandpaper, grinding wheel, steel wire brush and steel wire ball. The chemical method mainly uses the chemical reaction between acid and rust to achieve the purpose of rust removal. The main components of common rust remover in life are hydrochloric acid and dilute sulfuric acid, which can react with iron oxide. The principle is that the rust remover permeates the surface of steel products along the cracks between the rust layer and the impurity layer, causing dissolution and peeling of the rust layer and the impurity layer, so that the rust layer, impurities and oxide scale fall off the surface of steel products. However, acid is corrosive, so it is necessary to wear protective clothing when removing rust.
Can remove blackheads and whiten teeth? Listen to rumors. Be careful not to be beautiful.
Blackheads, also known as blackheads, are formed because sebaceous glands secrete too much sebum, which accumulates in the catheter, blocks and hardens, and then oxidizes and blackens in the air.
It is rumored that only a small amount of baking soda powder needs to be dissolved in water at a ratio of about 1: 10, and then wet it on the nose with a cotton pad or cotton ball. After 10 minutes, blackheads will all emerge.
In this regard, the online explanation is: "Baking soda is weakly alkaline after being dissolved in water. Under alkaline conditions, the main component oil of blackheads will undergo saponification reaction, and glycerol and fatty acid salts will be generated. Both glycerol and fatty acid salts have good water solubility, so the effect of blackheads can be achieved. " However, according to the report of Shell Network, this saponification reaction is relatively slow, and its speed has a great relationship with alkaline strength and reaction temperature. If it is at room temperature, under the weak alkaline conditions such as baking soda, if not completely unable to react, the reaction will wait until the end of time, and it will definitely not happen after "applying for more than ten minutes".
In this regard, Zhou Ping, the chief physician of the Department of Dermatology and Sexology, Beijing Shijitan Hospital affiliated to Capital Medical University, also clearly told reporters: "Treating blackheads with baking soda is a rumor and unscientific!" Baking soda can cause great irritation to the skin and cannot be used to remove blackheads. Zhou Ping told reporters that in medicine, baking soda is mainly used to treat acidosis, and it is intravenous injection. "No matter at home or abroad, there is no practice of external use of baking soda in clinic."
In addition to blackheads, yellow teeth also annoy beauty lovers. The net baking soda has the effect of whitening teeth, which experts say is also unscientific.
Tooth yellow is divided into endogenous and exogenous. Exogenous yellow teeth are caused by the habit of smoking, drinking tea and coffee, or eating foods with heavy soy sauce, dark color and easy staining for a long time, and teeth will accumulate some pigments in this process. Endogenous tooth yellow is caused by an element, which occurs in tooth tissue.
"For endogenous tooth yellow, it is useless to do tooth washing and sandblasting. Ultrasonic tooth cleaning can’t solve it, and baking soda can’t solve it. Exogenous tooth yellow is caused by living habits. Baking soda can’t react with the deposited pigment, but it can only play a friction role and can’t solve the problem of tooth yellow. " Wei Hui, a dentist at Xiamen Siming Zall Dental Clinic, told reporters.
Xu Jingling, deputy chief physician of the Department of Stomatology, Peking University Third Hospital, said: "For exogenous tooth yellow, conventional tooth washing and polishing can remove it and restore the white state of teeth. If the tooth itself is yellow, it can’t be cleaned. You can make tooth whitening and permanent porcelain veneer to improve the yellow state of the tooth. "
Although some studies show that toothpaste containing sodium bicarbonate has better whitening and plaque removal effects than toothpaste without sodium bicarbonate. But this does not mean that you can brush your teeth directly with baking soda. Experts say that baking soda itself is an alkaline substance. If baking soda is used for a long time to brush teeth, it will destroy the bad environment in the teeth and corrode the teeth themselves.
What can I do? Widely used in food and medicine industries.
Although baking soda can’t do all the work mentioned above, it does have many uses, mainly as food additives and antacids, and is widely used in food and pharmaceutical industries.
The most common use of baking soda is the kitchen — — Used as leavening agent for baking. When it reacts with acid, carbon dioxide will be released, causing the batter to swell. Can make pancakes, cakes, fast bread, soda bread and fried food. However, in the absence of acid, the thermal decomposition of sodium bicarbonate will produce sodium carbonate, and its strong alkalinity will make baked products bitter, soapy and yellow.
According to Xue Zhiyong, a researcher at Zhejiang Academy of Agricultural Sciences, in recent years, baking soda has been used as a feed additive (buffer) for livestock and poultry abroad. As a feed additive for ruminants, baking soda can play a buffering role in the rumen, neutralize the acidity of silage and organic acids produced by microbial fermentation in the stomach, keep the environment in the rumen neutral, provide a good growth environment for microorganisms, and facilitate the digestion of cellulose and other sugars. The experiment showed that the milk production peak of dairy cows fed with baking soda came early and kept high yield throughout the lactation period.
When sodium bicarbonate is heated, it will release carbon dioxide, so it can be used to put out fires, but it is not suitable for putting out open flames in oil pans, because its sudden release of gas may cause grease splashing. Baking soda can also be used to neutralize unwanted acid solutions or acid leaks in chemical laboratories.
Medically, sodium bicarbonate mixed with water can be used as an antacid to treat acid dyspepsia and heartburn; Can relieve or reduce the symptoms of gastric irritation caused by oral aspirin; It can also be blended with appropriate amount of water, and baking soda can be made into paste and applied locally to the skin to alleviate some insect bites and accompanying swelling.
In addition, according to the published literature, sodium bicarbonate also has weak disinfection performance, which is an effective method to control the growth of fungi, and has been registered as a biological pesticide by the US Environmental Protection Agency, and can be applied to spa pools and garden ponds to improve its total alkalinity.
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