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[Chemical Knowledge]：Distinguishing between arsenic acid and arsenous acid: exploring their variation

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Arsenic acid is an inorganic compound, its chemical formula is H3AsO4, is composed of arsenic and oxygen acid. Arsenic acid is another inorganic compound, chemical formula H3AsO3, is composed of arsenic and oxygen acid. It can be seen from the chemical formula that the difference between the two compounds is only the number of oxygen elements, but this subtle difference has led to differences in their physical and chemical properties and applications. The physicochemical properties of

arsenic acid are different from those of arsenous acid. Arsenic acid is a colorless crystal, soluble in water, acidic, can react with metal oxides to form salts. It decomposes at high temperatures and releases oxygen. Arsenous acid is a colorless liquid, reducing, can react with hydrochloric acid to form arsenic chloride and release sulfur dioxide gas. In addition, arsenic acid is often used as some chemical reagent preparation, and arsenous acid is mainly used for reduction reaction and some specific chemical synthesis process. There are also differences in the application areas of

arsenic acid and arsenous acid. Arsenic acid is widely used in industry as an insecticide, a preservative and a wood preservative. In addition, arsenic acid can also be used in the preparation of glass, ceramics, dyes and chemicals. However, the use of arsenic acid is subject to strict regulation and restrictions due to its toxicity to humans and the environment. On the contrary, arsenous acid is often used in dyes, pigments and chemical analysis due to its high reducibility. Although arsenous acid is also toxic to a certain extent, its impact on the human body and the environment is relatively small due to its small use. What

need to understand is the difference in toxicity between arsenic acid and arsenous acid. Arsenic acid has a strong toxicity to the human body, and can enter the human body through inhalation, ingestion or skin contact, causing serious harm to various systems of the body. Symptoms of poisoning include nausea, vomiting, abdominal pain, headache, toxic shock, etc., and may lead to death. The toxicity of arsenous acid is relatively low, but it still has a certain degree of danger, and it has certain irritation and damage to the human respiratory system and skin.

To sum up, although arsenic acid and arsenous acid in the chemical formula only a difference in oxygen, but has obvious physical and chemical properties, application areas and toxic differences. For this reason, we need to be vigilant in the use and handling of these two compounds and follow the relevant safety regulations and operating procedures to ensure human health and environmental safety.

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