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[Chemical Knowledge]：How to make hydrochloric acid

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Hydrochloric acid
is a colorless and transparent liquid, which is often used in chemical experiments and industrial production. There are many methods for preparing hydrochloric acid, and we will introduce two common methods for preparing hydrochloric acid.

method one: hydrochloric acid and sulfuric acid reaction method

one of the methods of preparing hydrochloric acid is the use of sulfuric acid and hydrochloric acid reaction to produce hydrogen chloride chemical reaction. The specific steps are as follows:

1. Take a certain amount of sodium chloride (NaCl), about 20 grams, and put it into a clean glass bottle.

2. Sulfuric acid (H2SO4) and water were mixed to give 50ml of concentrated sulfuric acid solution.

3. The concentrated sulfuric acid solution was slowly poured into a glass bottle containing sodium chloride and the mixture was heated. At the same time, it can be found that the generated gas quickly fills the entire bottle.

4. The gas is separated by the rubber stopper and the gas curved tube, and the water in the gas is removed by the purification equipment.

5. After the treatment of hydrogen chloride gas is put back into the aqueous solution, this time you can get concentrated hydrochloric acid.

method II: hydrochloric acid and hydrogen reaction method

In addition, the second method of preparing hydrochloric acid is to use the chemical reaction of hydrochloric acid and hydrogen. The specific steps are as follows:

1. a certain amount of hydrochloric acid is added into the reaction kettle, and hydrogen is flowed into the reactor at a constant flow rate.

2. In the process of feeding, it is necessary to adjust the temperature and the flow rate of the reactants to keep the reaction in equilibrium.

3. successfully prepared hydrochloric acid can be purified by common laboratory methods, such as atmospheric distillation.

, it is worth noting that this preparation process requires a high-pressure reaction, and compared with the first method, the operation of this method is more difficult.

summary

Through the above two methods, we can easily prepare hydrochloric acid. The first method uses hydrogen chloride gas produced by the reaction of sulfuric acid and sodium chloride to prepare, which is easy to operate, and finally can obtain high-purity hydrochloric acid. The second method requires the preparation by reaction of hydrochloric acid and hydrogen at a higher pressure. Different application scenarios require different preparation methods, so we need to choose according to actual needs.