“Tin hedgehog” experiment
How to grow a metal hedgehog in 5 minutes
Many of you may have heard about animals out of a test tube, but what about a metallic hedgehog out of a beaker?
Wear protective gloves, eyewear, and a mask. Perform this experiment in a well-ventilated area. Observe safety precautions when working with concentrated acids.
Reagents and equipment:
- piece of zinc;
- 5g tin(II) chloride;
- 70% acetic acid;
- distilled water;
- 2 beakers.
Combine 5 g of tin(II) chloride and 95 mL distilled water in the beaker. Watch as the solution turns cloudy. Add a few drops of acetic acid – the solution should become transparent.Tie the zinc pellet to a splint or pencil and immerse it in the solution. After 4 minutes, the zinc will be covered with spiky crystals.
When tin(II) chloride is dissolved, its hydrolysis takes place, and an insoluble precipitate of tin(II) hydroxide forms. The 70% acetic acid is added to reverse the hydrolysis and obtain tin(II) ions.