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[Chemical Knowledge]：How to match 1mol hydrochloric acid

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Hydrochloric acid is a common chemical reagent with a wide range of uses, including metal corrosion, cleaning and disinfection, and pharmaceuticals. In general, hydrochloric acid is sold as a hydrochloric acid solution with a concentration of HCl 37%. So, how to prepare 1mol of hydrochloric acid? This article will introduce the detailed preparation method, and explore the corresponding principle.

1. preparation method

1. material preparation: hydrochloric acid and pure water.

2. Calculate the volume of hydrochloric acid and water required: Calculate the volume of hydrochloric acid and water required according to a certain calculation formula.

3. Add hydrochloric acid: Pour the calculated hydrochloric acid into a clean glass bottle.

4. Add water: Pour the calculated water into the hydrochloric acid and slowly stir until well mixed.

5. Determination of concentration: Use universal PH test paper or PH meter to determine whether the concentration of prepared hydrochloric acid reaches 1mol/L.
Precautions for
2.

1. Strictly observe the required ratio of hydrochloric acid to water, otherwise it will cause inaccurate preparation.

2. hydrochloric acid preparation need to slowly add water, so as not to cause the reaction speed is too fast, resulting in a violent reaction of the solution, water spills and accidents.

3. Keep the container clean and sterile during the preparation process to avoid contamination affecting the preparation quality.

4. after the preparation, the need for concentration detection. If the concentration is lower than 1mol/L, it is necessary to continue to add hydrochloric acid as needed, otherwise, it is necessary to add an appropriate amount of water until the concentration is 1mol/L.
explain

the principle of 3. In chemistry, concentration refers to the volume ratio of the amount of solute in a solution to the solvent. The unit is usually mol/L, which represents the number of moles of solute per liter of solution. The HCl 37% hydrochloric acid solution with a concentration of 11.8mol/L is prepared by adding 37% hydrochloric acid in 11.8mol/L sodium hydroxide solution. Therefore, to prepare 1mol of hydrochloric acid, it is necessary to mix HCl 37% hydrochloric acid solution with appropriate amount of pure water. In this process, attention should be paid to the required volume and proportion, and whether the prepared concentration meets the requirements.

4. summary

above is the preparation of 1mol hydrochloric acid specific methods and precautions, hoping to provide some help to people who need such operations. In the process of preparation, it is necessary to strictly abide by the operating procedures and complete each step patiently and carefully to avoid accidents. At the same time, it is also necessary to understand the principle of preparation in order to deepen the understanding of chemical knowledge. In short, when we need to use hydrochloric acid, we can prepare a solution that meets the requirements through our own efforts to help our research and production.