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一、只用一种试剂的鉴别1.用水鉴别当被鉴别的几种物质的溶解性或密度或水解性不同时,常用水作试剂进行鉴别。例1.只用水就能鉴别的一组物质是()A.苯、乙酸、四氯化碳B.乙醇、乙醛、乙酸、C.乙醛、乙二醇、硝基苯D.苯酚、乙醇、甘油分析:因 A 中的苯不溶于水、且比水轻,乙酸易溶于水,四氯化
First, the identification of only one reagent 1. Identification of water When the solubility or density or hydrolyzability of the identified substances are different, water is often used as a reagent for identification. Example 1. A group of substances that can be identified only with water is () A. benzene, acetic acid, carbon tetrachloride B. ethanol, acetaldehyde, acetic acid, C. acetaldehyde, ethylene glycol, nitrobenzene D. phenol, Analysis of Ethanol and Glycerin: Since benzene in A is insoluble in water and lighter than water, acetic acid is easily soluble in water, tetrachlorinated