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原高中化学教材上,压强对平衡影响的演示实验效果不明显,笔者另辟蹊径,采用光电比色法效果显著。 一、实验原理:NO_2与N_2O_4混和气体的吸光度与NO_2的浓度成正比。 二、实验用品: 581-G型光电比色计、100毫升注射器、10公分凸视镜(a)(用于放大吸光度读数)、铜片、浓HNO_3、555玻璃胶、自制泡塑透镜座(b),如右图:
In the original high school chemistry textbooks, the effect of pressure on the balance of the demonstration experiment is not obvious. The author takes a different approach and uses the photoelectric colorimetry method to achieve significant results. First, the experimental principle: The absorbance of the mixed gas of NO 2 and N 2 O 4 is proportional to the concentration of NO 2 . Second, the experimental supplies: 581-G photoelectric colorimeter, 100 ml syringe, 10 cm convex mirror (a) (used to enlarge absorbance readings), copper, thick HNO_3, 555 glass, plastic foam lens holder ( b) as shown on the right: