Real time metal crystal growing
name: Tin crystal growing during electrolysis of tin (II) chloride solution
Tin(II) chloride is moderately toxic. Avoid contacting it with your eyes and skin. Wears safety goggles and chemical-resistant gloves.
Always follow general safety
recommendations. Please note that conducting chemistry
experiments you must comply with the relevant legal procedures in
Why does the tin dendrite grow?
By attaching the crocodile clips to the Petri dish edges we connect the tin(II) chloride (SnCl2) solution to the batteries. Once connected, the electric current starts to flow through the solution. Near to one of the clips, a tin reduction reaction takes place:
Sn2+ (solution) + 2e- → Sn(solid)
Tin is a metal that precipitates (forms a solid) as solid, elemental tin. The tin dendrite grows in the direction that the electric current flows through the solution; from one clip towards the other.