Add 80 ml of steel-containing waste liquid to a 100 ml beaker, put a few pieces of iron (such as iron sheets with more rust, should be cleaned with sandpaper first) and put them in a solution and heat them on low heat. When the N-reaction is carried out more completely, the solution is poured out by decantation, and the copper on the iron piece is scraped into the beaker. First wash the copper powder twice with tap water (can be washed by decantation), then filter the copper powder by vacuum filtration, wash the copper powder three times with steamed water on the funnel, draw a thousand, put the copper powder in the evaporating dish Inside, fry with a small fire and cool.
Take a 18 ml porcelain vortex (without cover), wash it and cool it, and weigh it on the balance. Add about 1 gram of self-made dried copper sulfate crystal to the citrus, and weigh it. The citrus sulfate of the copper sulfate is placed in the Mafu Guard, and the temperature is raised to 300 ° C and left for about 20 minutes.
When the blue copper sulfate body becomes white or grayish white, take out the vortex, cool it for a while, put it in the dryer, cool to room temperature, and weigh it. Each weighing was recorded and the number of moles of crystal water contained in one mole of copper sulfate crystals was calculated.
Adding less to the addition of anhydrous copper sulfate is distilled water, and observe the phenomenon. Finally, the copper sulfate solution is poured into a recycling bottle.
In the real face, other impurities should be avoided inside and outside the citrus vortex to ensure the accuracy of weighing.