Demonstration device of reaction between water or chlorine gas and precious metal

The invention relates to a demonstration device of reaction between water or chlorine gas and precious metal. The demonstration device is composed of an iron stand platform, a spring clamp, a file frame and a hand guard file provided with a protective handle. The spring clamp is specially used for fixing a precious metal block, and the protective file can vertically penetrate inside the file frame to file the precious metal. The spring clamp and the file frame can freely and vertically move on a vertical rod of the iron stand platform, can be fixed on the vertical rod of the iron stand platform according to the size and the height of a beaker containing the water or the chlorine gas, and can rotate by 360 degrees around the vertical rod of the iron stand platform. The demonstration device overcomes the defects of existing demonstration of reaction between the water or the chlorine gas and the precious metal, saves the precious metal, is simple in structure, safe, simple, convenient to use, and controllable in