Why do you wash your hands with soap, gasoline and kerosene?

Washing your hands with soap, gasoline and kerosene will peel off your skin because it will irritate you.

Soap has a wide range of uses, besides the familiar washing clothes, it is also widely used in the textile industry. Sodium salts of higher fatty acids are commonly used, which are generally called hard soaps; Its potassium salt is called soft soap, which is mostly used for washing hair and shaving. Its ammonium salt is usually used to make vanishing cream. According to the composition of soap, considering the fatty acid part, the soap made of fatty acid with high saturation is hard; On the contrary, soaps made of fatty acids with higher unsaturation are softer. The main raw material of soap is oil with high melting point. Considering the length of carbon chain, generally speaking, the carbon chain of fatty acid is too short, and the soap made is too soluble in water; If the carbon chain is too long, the solubility is too small. Therefore, only potassium or sodium salts of fatty acids from C 10 to C20 are suitable for making soap. In fact, soap contains the most fatty acid sodium salts, ranging from C 16 to C 18.

Soap usually contains a lot of water. Various soaps can be obtained by adding fillers such as spices and dyes into the finished products.

Commonly used yellow laundry soap is usually mixed with rosin, which is added in the form of sodium salt to increase the solubility and foaming of soap, and it is also cheaper as a filler.

White laundry soap is added with sodium carbonate and sodium silicate (the content can reach 12%), and the water content of general laundry soap is about 30%. If the white laundry soap is dried and sliced, you can get soap chips, which can be used to wash high-grade fabrics.

Adding a proper amount of mixture of phenol and cresol or boric acid into soap to make medicated soap. Soap needs high-grade raw materials, for example, the soap made by mixing butter or palm oil with coconut oil is crushed, dried until the water content is about 10% to 15%, then added with spices and dyes, and then pressed and molded.

Liquid potassium soap is often used as shampoo. , usually made of coconut oil.

Soaps are usually divided into hard soap, soft soap and fat soap. If some drugs are added to soap, it will become medicated soap, such as sulfur soap and sandalwood soap.

Hard soap is often called "smelly soap", which has high alkali content and strong ability to remove oil and dirt, but it is also very irritating to the skin. Repeated use can make the skin dry, rough and peeling quickly. Therefore, hard soap is generally only used for laundry, not for bathing.

Soft soap is the "soap" we usually use. Low alkali content and little irritation to skin. It has a good dandruff removal effect on skin lesions.