First remove some of the calcium hydroxide and add enough hydrochloric acid. If there is gas, it means it has deteriorated. Another method is to add insoluble matter after adding a sufficient amount of water, which indicates that it has deteriorated because calcium carbonate is insoluble in water. So is calcium hydroxide harmful to the human body? The following explanation, calcium hydroxide is a white solid, slightly soluble in water, and its aqueous solution is often called lime water, which is alkaline. It absorbs carbon dioxide, water, etc. in the air to deteriorate, and is usually called water absorption. Generally used for the improvement of buildings or acidic land. If the body inadvertently overdoes and absorbs calcium hydroxide, it can cause serious symptoms such as difficulty breathing, internal bleeding, hypotension, muscle spasms, obstruction of myosin and actin systems, and increased blood pH. Damage to the internal organs. Therefore, we must pay attention to the use of calcium hydroxide, especially for children, family members must be optimistic. Our common calcium hydroxide is often used to reduce soil acidity and improve soil structure. Bordeaux mixture made of calcium hydroxide is used for fruit trees and vegetables to eliminate pests.
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A method for identifying the purity of calcium hydroxide: Calcium hydroxide is easily hardened with carbon dioxide in the air to form calcium carbonate. Therefore, we only need to identify whether there is calcium carbonate in the calcium hydroxide powder, and we know whether it has deteriorated.