To determine which solutions can be identified as saturated, we need to refer to the solubility data typical for potassium and sodium salts at the given temperatures.
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KCl at 40 °C: From the standard solubility rules, KCl has a solubility of about 31 g in 100 g of water at 40 °C. Since 40 g of KCl is dissolved in 100 g of water, this exceeds the solubility limit, meaning the solution is not saturated (it is supersaturated).
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NaCl at 50 °C: The solubility of NaCl at 50 °C is approximately 36 g per 100 g of water. Since 40 g of NaCl is dissolved, this exceeds the solubility limit, meaning the solution is also not saturated (it is supersaturated).
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KNO3 at 50 °C: KNO3 has a solubility of about 109 g in 100 g of water at 50 °C. With only 70 g of KNO3 dissolved, this is below the solubility limit, indicating the solution is not saturated (it is unsaturated).
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NaNO3 at 0 °C: NaNO3 has a solubility of about 92 g in 100 g of water at 0 °C. The given solution contains 70 g of NaNO3, which is below the solubility limit, indicating this solution is also not saturated (it is unsaturated).
After reviewing all cases, it appears that none of the given solutions are saturated. However, if there were any inconsistencies in solubility limits or extreme conditions, further analysis would be needed. But based on the standard solubility data for these salts at the mentioned temperatures, we conclude:
None of the options A, B, C, or D can be identified as saturated.
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