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一、甲酸还原Cu(OH)_2的实验 1.试剂与配制: ①5％CuSO_4溶液(7.5克CuSO_4·5H_2O溶于93.6ml水中) ②10％NaOH溶液(11.1克NaOH/100ml水溶液) ③甲酸浓溶液(～80％) 2.操作与现象: 为了便于观察和对比,令反应在U形管中进行,采用水浴加热(90～95℃)。 先在U形管内倒入约20～30ml 10％NaOH溶液,使液面距管口约5cm。(如下图所示)从管口[Ⅰ]小心滴入3～5滴5％CuSO_4溶液,液面有Cu(OH)_2淀沉。然后慢慢滴入8～
First, formic acid reduction of Cu (OH) 2 experiments 1. Reagents and preparation: 15% CuSO 4 solution (7.5 g CuSO 4 · 5H 2O dissolved in 93.6ml water) 210% NaOH solution (11.1 g NaOH / 100ml water solution) 3 formic acid concentrated solution ( (80%) 2. Operation and Phenomenon: For the convenience of observation and comparison, the reaction is carried out in a U-shaped tube and heated with a water bath (90-95°C). First pour about 20-30 ml of 10% NaOH solution into the U-shaped tube so that the liquid surface is about 5 cm from the nozzle. (As shown in the figure below) Carefully drip 3 to 5 drops of 5% CuSO_4 solution from the nozzle [I]. There is Cu(OH)_2 precipitation on the liquid surface. Then slowly instill 8 to