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按中山大学,辽宁大学等校编的《无机化学实验》58页图3-1的装置测定镁的当量,误差较大。产生误差的主要原因是:反应管(3)在塞上橡皮塞时,管内空气被压缩(气压增大),导致量气管(1)内水面下降和漏斗(2)内水面升高。因量气管至漏斗的各部分内径不等,使上述两水面升降程度不等。不等高的水柱压力不同,故用调节漏斗高度的方法,难以准确地调整反应管内外的气压根等,这既影响氢气产生前的体积初读数,又影
According to Sun Yat-sen University, Liaoning University and other schools, “Inorganic Chemistry Experiment” 58 Figure 3-1 device determination of magnesium equivalent, greater error. The main reason for the error is that when the reaction tube (3) is stuffed with rubber plugs, the air in the tube is compressed (the air pressure is increased), causing the water level in the air tube (1) to drop and the water level in the hopper (2) to rise. Due to the amount of trachea to funnel each part of the inner diameter range, so that the above two water levels vary. Not equal to the pressure of the water column is different, so the method of adjusting the height of the funnel, it is difficult to accurately adjust the pressure inside and outside the reaction tube root and so on, which not only affect the volume of hydrogen before the beginning of reading,