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[Chemical Knowledge]：What are the role and uses of citric acid

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citric acid is anhydrous and monohydrate. Translucent crystal or white fine powder crystal. It's odorless and has a strong sour taste. Drying or heating to 40~50 ℃ to become anhydrous, anhydrous in dry air is easy to weather, slightly deliquescent. It becomes soft at 75 ℃ and melts at 100 ℃. Relative density 1. 542(-hydrate) and 1.67 (anhydrous). Soluble in water (monohydrate 209g]lOOmL,25 ℃; Anhydrous 59. 2g/lOOmL,20 ℃; The pH value of 1% solution is 2.31) and ethanol, soluble in ether. Natural products are found in citrus fruits such as lemons. Powder and air can form an explosive mixture. In case of open flame, high heat or contact with oxidant, there is a risk of combustion and explosion.

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Six effects

of citric acid 1. Complexing Fe3 + weakens the corrosion promotion effect of Fe3 +

2. Remove metal oxide scale such as iron and copper. It is easy and safe to operate and is suitable for various materials.

3. As a cleaning agent, citric acid has less corrosion rate to steel than hydrochloric acid.

4. This function is used to clean newly built large devices.

5. It is used to clean rust and calcium magnesium scale. Citric acid is mixed with EDTA and can be used to clean heat exchangers.

6. Used in the field of medicine, sodium citrate can prevent blood coagulation, calcium salt can be used as a gastric acid solution, barium salt is toxic.

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