Hydrochloric acid

Hydrochloric acid

Applications:

In analytical chemistry, when an acid is used to determine the concentration of a base, hydrochloric acid is generally used for titration. Titration with strong acid can make the end point more obvious, so that the results obtained are more accurate. At 1 standard atmospheric pressure, 20.2% hydrochloric acid can form an azeotropic solution, which is often used as a reference in quantitative analysis at a certain atmospheric pressure. Its constant boiling concentration will change with the change of air pressure.
Hydrochloric acid is often used to dissolve solid samples for further analysis, including dissolving some metals and forming easily soluble substances such as calcium carbonate or copper oxide to facilitate analysis.
Pickling Steel: One of the most important uses of hydrochloric acid is pickling steel. Before the subsequent treatment of iron or steel (extrusion, rolling, galvanizing, etc.), the rust or iron oxide on the surface can be reacted with hydrochloric acid. Generally, 18% hydrochloric acid solution is used as pickling agent to clean carbon steel.



Precautions:

When using hydrochloric acid, personal protective equipment should be used. Such as rubber or polyvinyl chloride gloves, goggles, chemical-resistant clothing and shoes, etc., to reduce the risk of direct contact with hydrochloric acid. Airtight operation, pay attention to ventilation. The operation is as mechanized and automated as possible. Operators must undergo special training and strictly abide by the operating procedures.