Introduction: Iron rust is a complicated process. It is necessary to know that iron and water or air are not easy to react. In the chemistry class, there is such an experiment: at normal temperature, the nails sealed in the dry test tube or immersed in the just boiled The nails in distilled water did not chemically react for a long time. Only nails that come into contact with air and water are prone to chemical reactions and rust. That is to say, iron is prone to rust in humid air.
The main component of rust is iron oxide, which is loose and easily absorbs water and combines with water to form hydrated iron oxide. There is no protection. Therefore, if the rust on the surface of the iron product is not removed in time, the internal iron will continue to rust, and the days will become a pile of useless waste. In this experiment, the oxygen consumption during the process of iron rust is detected.
Equipment required: PC with software installed; DrDAQ data logger; oxygen sensor; 1 liter beaker; beehive rack; sink; water; 5 g wire mesh (fine mesh) provides a large surface area; viscous viscous fixative.
Experimental setup: The experiment should be set as shown below.
1. Connect the DrDAQ data logger to the parallel port (or USB if using a USB to parallel port adapter).
2. Install the oxygen sensor on the honeycomb stand. Use a little tack to help hold it in place. Pass the connecting wire through the center hole of the honeycomb frame.
3. Fill the sink to a depth of about 3 cm at room temperature and place the honeycomb stand in the sensor. Plug the connecting wires into the external socket on the DrDAQ.
4. Fix the three "sticky fixatives" inside the 1 liter beaker, above the water level, and secure the wire rope to these. Now place the beaker on the honeycomb stand and pour it on the water to seal it in the air. Once the equipment is installed, place it in a centrally heated laboratory or room to maintain the equipment at a near constant temperature.
Experiment: Load the software and configure it to sample every minute (oxygen sensor readings) once, for a total of 1440 samples for a full day. Then click to start recording. When the data recording is completed, the percentage (%) of oxygen is plotted against time.
Further research: the extension of the experiment may be to put the water tank, honeycomb frame, oxygen sensor, beaker, wire mesh, etc. into a thermostatically controlled heating water bath or heating plate to see if the temperature affects the rusting speed. You can also see the effects of low temperatures, but when the oxygen sensor's operating range is 5oC to 40oC, use it properly within its operating temperature range.
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