First, the main components of salt
1. Salt refers to sea salt, well salt, mineral salt, lake salt and earth salt from different sources. Their main component is sodium chloride, and the state stipulates that the sodium chloride content of well salt and mineral salt shall not be less than 95%. Sodium chloride, the main component of salt, ionic compound. Pure sodium chloride crystal is a colorless and transparent cubic crystal. Due to the existence of impurities, sodium chloride is generally white cubic crystal or fine-grained powder.
2. In a broad sense, salt is a neutral (uncharged) ionic compound composed of metal cations (positively charged ions) and acidic anions (negatively charged ions). Salts containing hydrogen ions are called acid salts, such as ammonium bicarbonate (NH4CO3); Sodium bisulfate (NaHSO4) salt containing hydroxyl ions is called basic salt.
3. Salt refers to nutrients containing iron, calcium, zinc, potassium, sodium and iodine. The salt we eat is just a kind of salt, which contains sodium. Salt is also an indispensable component of human body. For example, iron is the main component of blood and calcium is the main component of bones. Salt can also regulate human activities, for example, people will feel dizzy if they lack sodium.
4. Chemical salt refers to the product of neutralization of acid and alkali. Common salts are normal salts (strong acid and alkali salts, strong acid and weak alkali salts, weak acid and weak acid salts), acid salts (such as CuH(CO)) and basic salts.
Second, the role of salt.
Salt is an indispensable condiment in people's diet and an indispensable substance for human body. Its main component is sodium chloride, which is a neutral inorganic salt. It is salty in taste and cold in nature, and enters the stomach, kidney and large intestine. There is a certain relationship between salt intake and the incidence of hypertension. Excessive salt intake in the diet can easily cause hypertension. China stipulates that healthy adults can meet the body's need for sodium by taking 6 grams of salt every day. Salt can help digestion, participate in body fluid metabolism, diminish inflammation and reduce swelling.