Usually, hydrogen chloride is prepared by splitting rock salt or hydrochloric acid with sulfuric acid, and may be composed of chlorine and hydrogen. The hydrogen used in the composition is sometimes replaced with industrial gas with high hydrogen content. Similarly, hydrogen chloride can also be obtained from many organic waste gases. Crude hydrogen chloride is always rich in some impurities, and its composition and quantity depend on the preparation method of hydrogen chloride. It is usually rich in water vapor and impurities such as N_2 and H_2. Hydrogen chloride composed of chlorine and hydrogen is relatively pure.
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