To determine which solutions can be identified as saturated, we need to refer to solubility graphs for the salts involved (NaCl, KCl, KNO3, and NaNO3) at the specified temperatures. A solution is considered saturated when it has dissolved the maximum amount of solute possible at that temperature.
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40 grams of NaCl dissolved in 100 grams of water at 50°C: Generally, NaCl has a high solubility, typically around 36-40 grams per 100 grams of water at this temperature. Thus, 40 grams would likely saturate the solution.
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40 grams of KCl dissolved in 100 grams of water at 40°C: KCl has a solubility of around 33 grams per 100 grams of water at 40°C, so this would also lead to a saturated solution.
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70 grams of KNO3 dissolved in 100 grams of water at 50°C: KNO3 has a higher solubility at this temperature, around 65 grams per 100 grams of water. Therefore, 70 grams exceeds its solubility limit and would not be saturated.
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70 grams of NaNO3 dissolved in 100 grams of water at 0°C: The solubility of NaNO3 at 0°C is about 70 grams per 100 grams of water. Thus, this would be a saturated solution.
Based on this analysis, the saturated solutions are:
- 40 grams of NaCl in 100 grams of water at 50°C
- 40 grams of KCl in 100 grams of water at 40°C
- 70 grams of NaNO3 in 100 grams of water at 0°C
So the final answer includes the first two and the last option, while 70 grams of KNO3 at 50°C is not saturated.
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