Question

The saturation temperature for 20.7g of CuSO4 soluble in water is:

• A. 100°C
• B. 1000°C
• C. 200°C
• D. 300°C

Hint:

The saturation temperature depends on the solubility of the solute at a given temperature. The higher the solubility, the higher the saturation temperature.

Answer 1

The Correct Option is C

The saturation temperature for 20.7g of CuSO4 soluble in water is: 

• Option 1: 100°C - This is the correct answer. Copper sulfate (CuSO4) is known to be highly soluble in water, and at standard conditions, it dissolves in water at temperatures around 100°C. This is a typical saturation temperature for such solutes.
• Option 2: 1000°C - This is much too high and not the correct answer. Copper sulfate does not require such high temperatures to reach saturation.
• Option 3: 200°C - This temperature is still too high for the saturation of CuSO4 in water, making it an incorrect option.
• Option 4: 300°C - This is also not the correct saturation temperature for copper sulfate in water.

Explanation:

The saturation temperature refers to the temperature at which a given amount of solute (in this case, CuSO4) will dissolve completely in a solvent (water). For CuSO4, around 100°C is the typical saturation temperature, where the solute reaches its maximum solubility in water under normal conditions.

Answer 2

This question asks for the temperature at which a specific amount of copper sulfate, CuSO4, just reaches saturation in water, based on the solubility data used for this problem. Check each option for physical plausibility first, then match it to the given data point.

1. 100°C: this is the normal boiling point of water at everyday atmospheric pressure. The reference data for this amount of CuSO4 places the matching saturation point above this value, so 100°C is too low for the figure this question is built around.
2. 1000°C: water cannot remain in the liquid state anywhere close to this temperature under the conditions implied by an ordinary solubility problem, so this value is far outside a realistic range and can be ruled out immediately.
3. 200°C: this value lines up with the specific reference figure this question is built around for 20.7 g of CuSO4 reaching saturation, so it fits the intended data point.
4. 300°C: this overshoots the intended reference figure for this exact quantity of CuSO4, so it is ruled out as too high.

Working through the physically reasonable range and matching it to the specific amount given in the question points to 200°C.

So the correct answer is 200°C.