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Create a “floating tin sponge” by reacting zinc with tin(II) chloride in acidic solution. With The Floating Tin Sponge: A Double Redox Demonstration—ChemTopic™ Lab Activity, two separate single replacement reactions are visible as beautiful crystalline tin needles form on the zinc surface and combine to produce an open, lattice-like material that resembles steel wool, which bobs, rises and finally floats to the surface as the solution effervesces. Available as part of the Oxidation and Reduction—ChemTopic™ Labs digital collection. Click the Price link for digital collection pricing.