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在过去的许多教材中都说稀硝酸和金属镁作用不放出氢气。近几年来,我们对此问题进行了多次的实验,实验结果证明:一定浓度的稀硝酸和镁作用能够放出氢气。现将我们的实验情况记录于下:1.在试管中加入约半角匙镁粉和一定量的水,即可看到有极少量的气泡发生,但反应很快就终止了。这是因为生成的 Mg(OH)_2沉积在金属镁表面阻碍了金属镁进一步和水作用
In many textbooks in the past, dilute nitric acid and metallic magnesium do not emit hydrogen. In recent years, we have conducted many experiments on this issue, the experimental results show that: a certain concentration of dilute nitric acid and magnesium can release hydrogen. Now we record the experimental conditions in the following: 1. In the test tube by adding about a half tablespoon of magnesium powder and a certain amount of water, you can see a very small amount of bubbles, but the reaction ended soon. This is because the deposition of Mg (OH) 2 on the surface of metallic magnesium hinders the further interaction of metallic magnesium with water