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[Chemical Knowledge]：Properties and Uses of Hydrochloric Acid

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The nature and use
of hydrochloric acid in the field of chemical production raw materials
1. the nature of hydrochloric acid

hydrochloric acid is a strong inorganic acid, irritating and corrosive. It is a colorless and transparent liquid and is widely used in industry. Hydrochloric acid has the following properties:

1. Strong acidity: Hydrochloric acid is a strong acid, with strong acidity, can react with many metals, metal oxides, bases and other substances.

2. Volatility: Hydrochloric acid has high volatility and can be easily volatilized in the form of gas to form hydrochloric acid mist.

3. Corrosion: Hydrochloric acid is corrosive to many materials, including metals, plastics and rubber.

4. reducibility: hydrochloric acid has a certain reducibility and can be oxidized by some strong oxidants.

2. the use of hydrochloric acid

hydrochloric acid has a wide range of uses in the field of chemical production raw materials, the following is its main application areas:

1. pickling: hydrochloric acid can be used for pickling of metal surfaces to remove surface oxides and rust, so that the metal surface becomes smooth and clean.

2. Preparation of inorganic compounds: Hydrochloric acid can be used to prepare many inorganic compounds, such as sodium chloride, calcium chloride, zinc chloride, etc.

3. organic synthesis: hydrochloric acid can be used in organic synthesis, such as the preparation of vinyl chloride, chlorobenzene and so on.

4. Leather processing: Hydrochloric acid can be used in leather processing to soften leather and improve its quality.

5. Food processing: Hydrochloric acid can be used in food processing as an acidity regulator and preservative. The production method of

3. hydrochloric acid

hydrochloric acid can be produced by the following methods:

1. chlorine and hydrogen reaction method: chlorine and hydrogen are mixed and ignited to generate hydrogen chloride gas, and then hydrogen chloride gas is dissolved in water to obtain hydrochloric acid.

2. hydrochloric acid hydrochloric acid method: the reaction of salt with sulfuric acid to generate sodium sulfate and hydrogen chloride gas, and then the hydrogen chloride gas dissolved in water can be hydrochloric acid.

4. Precautions for the use of hydrochloric acid

Because hydrochloric acid is corrosive and irritating, it is necessary to pay attention to the following matters during use:

1. Wear protective equipment: When using hydrochloric acid, you need to wear protective clothing, gloves, goggles, etc. Protective equipment to avoid contact with the skin and eyes.

2. Ventilation: When using hydrochloric acid, it needs to be carried out in a well-ventilated environment to reduce the hazards of hydrochloric acid mist.

3. Storage and transportation: Hydrochloric acid needs to be stored in a cool, dry and ventilated place, avoiding direct sunlight and high temperature. During transportation, it is necessary to ensure that the container is tightly closed to avoid leakage.

In short, hydrochloric acid has a wide range of uses in the field of chemical production raw materials, but it is necessary to pay attention to safety matters during use to avoid harm to the human body and the environment.

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