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若按中山大学等校编《无机化学实验》课本第91页微溶性锂盐的实验方法进行,往往得不到碳酸锂和磷酸锂的白色沉淀。现对这一实验做了一点改进。一、碳酸锂沉淀生成实验改进[方法一] 将1M LiCl溶液1ml和0.5M Na_2CO_3溶液1ml混合后在酒精灯上加热近沸,并用玻璃棒磨擦试管内壁,这时会出现大量沉淀。因为Li_2CO_3溶解度随温度的升高而降低,所以加热降低了沉淀的溶解度。
If the experimental method of the slightly soluble lithium salt on page 91 of the textbook “Inorganic Chemistry Experiment” edited by Sun Yat-Sen University et al. is performed, white precipitates of lithium carbonate and lithium phosphate are often not obtained. Some improvements have been made to this experiment. First, the precipitation of lithium carbonate to improve experimental methods [Method 1] 1M LiCl solution 1ml and 0.5M Na2CO3 solution mixed 1ml after heating on the alcohol lamp near boiling, and rubbing the inner wall of the tube with a glass rod, then there will be a lot of precipitation. Because Li 2 CO 3 solubility decreases with increasing temperature, heating reduces the solubility of the precipitate.