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在铝与盐酸反应的实验中出现的黑色现象是一个让许多教师困惑的问题。贵刊2001年第3期王思强老师的“浅议铝与酸反应中的溶液变黑现象”一文认为:酸的浓度过高,与铝片反应时从其表面蚀下大量铝的碎末,这些碎末是黑色的。笔者认为,并不完全如此,还值得进一步探讨。实验室的铝片是用铝锭加工而来,国家标准(GB/T1196-1993)《重熔用铝锭》分为六个牌号,其中规定最高
The black phenomenon that occurs in the reaction between aluminum and hydrochloric acid is a problem that many teachers are confused about. In your article “The phenomenon of blackening of the solution in the reaction of aluminum and acid” by Professor Wang Siqiang, No. 3, 2001, the article states that the concentration of acid is too high, and that when aluminum reacts with aluminum flakes, large amounts of aluminum are etched away from the surface. The end is black. The author believes that this is not exactly the case and it is worth further discussion. The laboratory aluminum sheet is processed from aluminum ingots. The national standard (GB/T1196-1993) “Remelted aluminum ingots” is divided into six grades, with the highest