[Chemical Knowledge]：What is Reagent?

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Reagents are chemical substances used in scientific experiments, also known as experimental reagents, including a variety of different chemical reagents, used for different experimental purposes. Reagents are commonly used to analyze and measure chemical constituents and properties in chemical or biological samples. They are essential tools in laboratory research and manufacturing processes.

reagent can be a single chemical or a mixture. Many reagents are of high purity to ensure the reliability and precision of the experiment. Many reagents also require stability in certain environments, such as low temperature or non-light environments.

commonly used experimental reagents are as follows:

1. water: water is one of the most commonly used laboratory reagents. In most laboratories, water is used to prepare other reagents or to wash reactors, clean laboratory equipment, etc.

2. Acid: Acid is a chemical substance with acidic properties, which is widely used in laboratories. Acids have different strengths and pH values and are mainly used to regulate reaction conditions and catalyze chemical reactions.

3. Alkali: Alkali is a chemical substance that is alkaline and is also common in the laboratory. The base is mainly used to neutralize the acid and adjust the pH value.

4. Salt: A salt is an ionic compound formed by neutralization of positive and negative ions by electrons. In the laboratory, salt is the basis for many chemical reactions and the preparation of many other chemicals.

5. Solvent: A solvent is a chemical substance used to dissolve, dilute, separate, or extract other chemical substances. In the laboratory, common solvents include methanol, ethanol, acetone, dimethyl sulfoxide, ethylene glycol and tetrahydrofuran.

6. Indicator: Indicator is a chemical reagent that can show changes in substances in chemical reactions. Indicators are mainly used to judge the process and results of chemical reactions. The most common indicators are phenolphthalein and phenolphthalein red.

7. Complexing agent: Complexing agent is a chemical reagent with complexing ability, which can coordinate with metal ions to form complexes. Complexing agents are widely used in chemical reactions for the separation, detection, analysis and determination of metal ions. The use of

reagents in the laboratory requires attention to laboratory safety and environmental protection requirements. Reagents in the laboratory need to be stored in the right place, and waste needs to be handled and disposed of in the right way. Laboratory personnel need to be professionally trained and comply with laboratory safety and environmental regulations to ensure the sustainability of laboratory research and manufacturing.