1. Chemical reaction of reducing agent
hydrogen is a strong reducing agent and is often used in reduction reactions in chemical synthesis experiments. For example:
- hydrogenation reaction reduction of unsaturated compounds (e. G. Alkenes, alkynes) to saturated compounds by catalytic hydrogenation.
- Metal Extraction and Purification: Hydrogen can reduce certain metal oxides to pure metals, such as copper oxide (CuO) to copper in the laboratory.
2. Carrier gas for gas chromatography
hydrogen is often used as a carrier gas in gas chromatography (GC) because of its small molecular weight, fast flow rate and good thermal conductivity. The use of hydrogen as a carrier gas can shorten the analysis time and improve the separation effect, but because hydrogen is flammable, special attention should be paid to safety when used.
3. Fuel and flame experiments
in the flame experiment, hydrogen can be used as fuel, often used in flame reaction and other experiments. Hydrogen combustion produces water and does not produce pollutants, so it has certain applications in environmental analysis and other experiments.
4. Preparation of hydrogen compounds
in the laboratory, hydrogen can be used to prepare a variety of compounds, such as ammonia (NH), hydrochloric acid (HCl) and so on. Hydrogen and nitrogen react chemically at high temperature and high pressure to generate ammonia; React with chlorine to generate hydrogen chloride gas.
5. Calibration and calibration gases
in analytical chemistry, hydrogen can be used as a standard gas for calibrating gas detection equipment or for gas concentration calibration. The purity and stability of hydrogen can ensure the accuracy of experimental results.
6. Low temperature refrigerant
in low temperature experiments, liquid hydrogen can be used to cool the equipment. Although liquid hydrogen is not often used directly in laboratories, it has potential use in studying the properties of ultra-low temperature substances.
7. Semiconductor and Materials Preparation
in some material experiments, hydrogen is used for the growth and cleaning of semiconductor materials, such as the preparation of thin film materials by plasma enhanced chemical vapor deposition (PECVD) methods. The hydrogen plasma can also clean and etch material surfaces.
It should be noted that hydrogen is flammable and explosive. When using hydrogen in the laboratory, there should be a good ventilation system and strict safety protection measures to prevent leakage and explosion risks.