Effect of electrolyte on the shapes of Liesegang rings

초록

This study describes how the shape of Liesegang rings differ depending on the concentration of internal and external electrolytes and the temperature, known as the principle of spherulitic rock formation. We disclose the chemical aspect of the Liesegang phenomenon. The sizes of Liesegang rings are larger for a concentration of internal electrolyte of 0.02 M than for 0.01 M. In addition, according to observation at gelatin temperature of 30°C and 40°C, the shapes of Liesegang rings were clearer at 30°C but the rings formed faster at 40°C. When external electrolyte was added to the internal electrolyte under the same condition, adding a calculated amount of external electrolyte was added little by little, caused the Liesegang rings to form clearly, but if the same amount of external electrolyte was added all at once, the radii of the rings were larger but the boundaries were less clear and there were fewer rings. Regarding the principle that gel is cooled inside volcanic rock and forms radial spherulitic rock, the results of this experiment show that, in addition to cooling rate and viscosity, there may be other causal factors such as chemical substances contained in the gel or intruding from outside that alter the solubility product constant of precipitating substances.

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