A solution of KClO3 (potassium chlorate) with a solubility of 30 g per 100 g of H2O at a temperature of 70°C is described as a saturated solution.
In this context:
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Saturated means that the solution has dissolved the maximum amount of solute (KClO3) at that particular temperature (70°C). Any additional KClO3 added to the solution would not dissolve and would remain as solid in the container.
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Supersaturated would imply that the solution contains more solute than its solubility limit, which is not the case here since it is exactly at the solubility limit.
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Unsaturated means that there is still the capacity to dissolve more solute in the solution, which is also not the case here, as it has already reached the solubility limit of 30 g per 100 g of water.
Therefore, given the information, the solution is saturated.