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Chemical experiments are an important part of analytical chemistry learning, and distinguishing between benzene and ethylbenzene is one of the common tasks in the laboratory. Benzene and ethylbenzene are very similar in structure, but they have some obvious differences. Therefore, scientists have developed a series of reagents to distinguish between benzene and ethylbenzene, which play a crucial role in the laboratory. This article will introduce several commonly used reagents for distinguishing between benzene and ethylbenzene, as well as their specific applications. 1、 Bromine water is one of the commonly used reagents to distinguish between benzene and ethylbenzene. In the experiment, different reaction products with benzene and ethylbenzene can be observed using bromine water. Dissolving substances in bromine water is prone to substitution reactions. Benzene does not react in bromine water, while ethylbenzene can react with it to form bromoethane. Therefore, by observing the reaction of the sample in bromine water, it can be preliminarily determined whether the sample contains benzene or ethylbenzene. 2、 Nitrate sodium is also one of the important reagents for distinguishing between benzene and ethylbenzene. In the experiment, the use of sodium nitrate can observe different phenomena in the reaction between the sample and it. Benzene reacts slowly with sodium nitrate at room temperature, while ethylbenzene reacts rapidly with sodium nitrate at room temperature. By observing the reaction rate between the sample and sodium nitrate, it can assist in determining whether the sample contains benzene or ethylbenzene. 3、 Oxidants are also one of the common reagents used to distinguish between benzene and ethylbenzene. In the experiment, different phenomena of the reaction between the sample and the oxidant can be observed. Benzene initially does not react with oxidants, while ethylbenzene can quickly react with oxidants to form p-methylbenzoic acid. By observing the reaction between the sample and the oxidant, it can be further determined whether the sample contains benzene or ethylbenzene. The above introduces several commonly used reagents for distinguishing benzene and ethylbenzene, which play a crucial role in chemical experiments. Through these reagents, we can accurately and quickly distinguish benzene and ethylbenzene in experimental samples, providing important basis for further analytical chemistry research. In future experiments, we hope that everyone can proficiently and flexibly use these reagents to make greater contributions to scientific research.