Laboratory Preparation of Hydrochloric Acid

Many experiments can be carried out in the laboratory of inorganic chemistry. Thus, if we want to obtain hydrogen chloride (HC1), which is often referred to as a hydrochloric acid gas, it is necessary to pour some sulphuric acid through a tube over the crystals of sodium chloride in flask. The flask is to be heated. On warming the flask, the hydrogen chloride is expelled as colourless gas with a suffoсating odour.

It produces heavy clouds white fumes when it comes in contact with the moist air of the room. It is soluble and it cannot be collected over water as are oxygen and hydrogen. It is much heavier than the air and may be passed through a glass tube to the bottom of a bottle.

Ca(OH)₂ + 2NH₄Cl = CaCl₂ + 2NH₃ +2H₂O

CH₃CH₂OH ^H2SO4Br2 CH₂ = CH₂ () + H₂O

Cu (OH)₂ = CuO () + H₂O

4P + 5O₂ = 2P₂O₅

17. Answer the questions:

1. What is the laboratory method for the preparation of hydrogen based on?

2. Where is gas to be collected?

3. How can the zinc's rate of reaction be controlled?

4. Can the evolution of gaseous hydrogen be observed?

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