Iron silicate crystals. These crystals have grown as a result of iron (III) chloride being added to a solution of sodium silicate (also known as water glass). The salt partially dissolves in the water and its ions react with silicate ions to form a thin layer of insoluble iron silicate. This layer is semi-permeable,and the more concentrated salt solution inside the tube pushes outwards due to osmosis. This bursts the tube,releasing more salt solution and forming a new tube,and the process continues. As the pressure is greater further down the water column,the tubes grow upwards | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Beautifulchemistry.net |
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