The solubility of calcium carbonate in water is very small. When it is less than a certain degree, we say that it is insoluble in water, and some rice will still be soluble in water, resulting in an aqueous solution of calcium carbonate, in which excessive hydroxyl ions will appear, so it is alkaline. Calcium carbonate solid is neither acidic nor alkaline, and it is difficult to dissolve in water, because carbonate is a weak acid, which is alkaline when it is hydrolyzed in water, producing hydrogen free radicals and hydroxyl free radicals, but it is not very strong.

Use of calcium carbonate

Calcium carbonate is used as raw materials for building materials, ceramics, glass, lime, cement, etc. Can be widely used in medicine, food, health care products, industry and other industries. Ultrafine calcium carbonate can be used in medicine. Light calcium carbonate is mainly used in paper industry, interior decoration materials, handicrafts and medicine. ?

Calcium carbonate is widely used in waterborne coatings industry, which can make coatings have the characteristics of non-sedimentation, easy dispersion and good luster, and the dosage in waterborne coatings is 20-60%.

Refer to the above content: Baidu Encyclopedia-Calcium Carbonate