ACT Science Practice Questions - ACT Science Section (Enhanced ACT 2025) Exam

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Table 1 (from Question 1) shows the solubility of four salts at three temperatures. A student needs to dissolve 50 g of Na2SO4 in 100 mL of water. Based on Table 1, at which of the following temperatures is this most likely to succeed? Salt | 20°C | 40°C | 60°C Na2SO4 | 19.5 | 48.8 | 45.3

20°C, because Na2SO4 is most soluble at low temperatures 40°C, because solubility exceeds 50 g/100 mL at that temperature 60°C, because temperature always increases solubility Any temperature, because Na2SO4 always dissolves completely

Correct Answer:

40°C, because solubility exceeds 50 g/100 mL at that temperature

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