① It is clear that calcium hydroxide, the main component of limewater, belongs to medium-strong alkali, which can be completely ionized in solution to generate hydroxide ions. The main component of facial tissue is protein. Higher concentration of hydroxyl ions will destroy hydrogen bonds in protein and carboxyl groups in protein. The principle is as follows:
Its essence is that hydroxyl ions change the secondary and tertiary structures of proteins.
② Even though it has been proved that calcium hydroxide has destructive effect on protein and can corrode the skin, its solubility is not great. At room temperature, the most soluble calcium hydroxide in 100g water is less than1g. This leads to the fact that the concentration of hydroxyl ions in the clarified limewater is very small, and the corrosion effect on the skin is very weak. Therefore, the organization will not be damaged immediately.
To sum up, it is not correct to clarify that lime water will decompose immediately when splashed on the face. But even so, it is best to clean the spilled skin with dilute acetic acid solution, which can resist the injury more thoroughly. However, if stronger alkali, such as sodium hydroxide and potassium hydroxide, comes into contact with the skin, it needs immediate treatment, and if you feel unwell, you need to see a doctor immediately.