medium · Enhanced ACT science
Students dissolved a fixed mass of KNO_3 in 100 g of water and recorded the maximum amount that would dissolve (solubility) at several temperatures:
| Temp (^circC) | Solubility (g per 100 g water) |
| :--- | :--- |
| 20 | 32 |
| 30 | 46 |
| 40 | 64 |
| 50 | 85 |
| 60 | 110 |
A separate sample held 75 g of KNO_3 dissolved in 100 g of water.
As this sample is slowly cooled from 60 ^circC, at approximately what temperature will the first solid crystals begin to form?
- Just below 60 ^circC, because 75 g already exceeds the 60 ^circC solubility
- Between 40 ^circC and 50 ^circC
- Below 20 ^circC, since 75 g stays fully dissolved at every listed temperature
- Exactly 30 ^circC, where solubility is 46 g
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