Blue crystals of copper vitriol are extremely beautiful. Experience on their cultivation can interest for a long time your preschool child and even the school student — the child with pleasure will observe how crystals grow on a thread. For the pupil of high school this experience can become introduction to one of the most interesting sciences — a crystallography.
It is required to you
- Copper vitriol
- Water
- Filter paper
- Cotton thread
- Magnifying glass
- Tweezers
- Ware for solution preparation
- Transparent glass vessel crystallizer
- Integumentary glass
- Flat stick which length is more than diameter of a mouth of a vessel
Instruction
1. Warm up water to 45-50 °C. Prepare saturated solution of copper vitriol, gradually dissolving powder in water before complete cessation of further dissolution. Filter the received solution through filter paper and fill in it in a crystallizer.
2. Tie cotton thread to a stick. Lower thread approximately to a half in a vessel with solution. Cover a vessel with integumentary glass that there dust did not get. But it is necessary to cover not really densely as air has to get to a vessel.
3. Put a vessel to the quiet place approximately for day. During cultivation of crystals, solution cannot be stirred up and shaken up. It can lead to dissolution of already formed crystals. In a day by means of magnifying glass consider formed on thread and at the bottom of a kristallika vessel. Choose the largest and correct. Carefully by means of tweezers remove the others. Leave 4-5 crystals, and the distance between them has to be sufficient for their growth. Crystals should not adjoin, otherwise they will grow together. Further with a growth of crystals it is necessary to watch that at once with them new were not formed. It is impossible to add solution to a crystallizer.