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[Chemical Knowledge]：Properties and Uses of Sodium Thiosulfate

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Sodium thiosulfate is an important raw material for chemical production, which has a wide range of properties and uses. This article will detail the properties, production methods, quality standards, safety and applications of sodium thiosulfate in different fields.

1. the properties of sodium thiosulfate

sodium thiosulfate (Na2S2O3) is a white crystalline powder with strong reducibility and alkalinity. It is easily soluble in water and insoluble in ethanol and ether. Sodium thiosulfate is unstable in the air and is easily oxidized to sodium sulfate and sulfur dioxide. In addition, sodium thiosulfate also has good thermal stability, can be decomposed at high temperature to produce sodium sulfate, sulfur dioxide and sulfur.

2. sodium thiosulfate production method

sodium thiosulfate production method mainly has two kinds: one is by the sodium sulfite and sulfur powder mixed reaction system; the other is by the sodium hydroxide and sulfur dioxide reaction, and then with sulfur powder reaction system. Among them, the first method is more commonly used, because the raw materials are easy to obtain, the operation is simple, and the product purity is high.

3. the quality standard
of sodium thiosulfate
In order to ensure the quality and safety of the product, sodium thiosulfate needs to meet certain quality standards. Generally speaking, the product quality standards of sodium thiosulfate include appearance, purity, water insoluble matter, chloride, sulfate, heavy metal and other indicators. Among them, the purity is an important indicator to measure the quality of the product, the general requirements of more than 98%.

4. safety
of sodium thiosulfate
Although sodium thiosulfate is widely used in chemical production, there are some safety problems. It is irritating to the skin and eyes, and long-term exposure may cause allergies or damage. In addition, sodium thiosulfate has poor stability in the air and is easily oxidized into harmful substances, so safety measures need to be paid attention to during storage and use.

to 5. the use of sodium thiosulfate

1. chemical production: sodium thiosulfate is widely used in chemical production, can be used as a reducing agent, bleaching agent, dechlorination agent. For example, in the production of dyes, sodium thiosulfate can be used as a reducing agent to reduce the chromophoric groups in dyes; in the paper industry, sodium thiosulfate can be used as a bleaching agent to improve the whiteness of pulp.
2. Pharmaceutical field: Sodium thiosulfate is also widely used in the pharmaceutical field, and can be used as an antidote, anti-allergic agent, etc. For example, in the treatment of cyanide poisoning, sodium thiosulfate can be used as an antidote to react with cyanide to generate non-toxic thiocyanate; in the treatment of allergic diseases, sodium thiosulfate can be used as an anti-allergic agent to reduce allergic reactions.
3. analytical chemistry: sodium thiosulfate in analytical chemistry also has important applications, can be used as titrant, standard solution, etc. For example, in the iodometric method, sodium thiosulfate can be used as a titrant, which reacts with iodine to form a colorless iodide, which is used to determine the iodine content of a sample.

In conclusion, sodium thiosulfate, as an important raw material for chemical production, has a wide range of properties and uses. In the process of production and use, it is necessary to pay attention to its safety and quality standards to ensure the quality and safety of the product.

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