Chemistry worksheet featuring a solubility curve graph used to answer questions about solids A, B, and C.

Let's go through each question step by step using the Solubility Curve Graph provided.

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Understanding the Graph:

- The x-axis is temperature in °C (from 20°C to 90°C).
- The y-axis is solubility in grams per 100g of water.
- Three solids are plotted:
- Solid A: Steeply increasing curve → high solubility increase with temperature.
- Solid B: Moderately increasing curve.
- Solid C: Nearly flat line → very little change with temperature.

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Answers:

#### 1. What is the Solubility of Solid A at 40°C?
- Locate 40°C on the x-axis.
- Move up to the curve for Solid A.
- Read the y-value: approximately 80 g per 100g of water.

✔ Answer: 80 g/100g water

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#### 2. What is the Solubility of Solid B at 30°C?
- Find 30°C on x-axis.
- Go up to Solid B curve.
- Read y-value: about 65 g per 100g water.

✔ Answer: 65 g/100g water

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#### 3. What is the Solubility of Solid C at 60°C?
- At 60°C, Solid C's curve is flat.
- It stays around 40 g per 100g water across all temperatures.

✔ Answer: 40 g/100g water

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#### 4. How much of Solid A will dissolve in 100g of water at 80°C?
- At 80°C, find Solid A.
- Y-value is approximately 170 g per 100g water.

✔ Answer: 170 g

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#### 5. How much of Solid B will dissolve in 100g of water at 40°C?
- At 40°C, Solid B is around 70 g per 100g water.

✔ Answer: 70 g

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#### 6. Which Solid is the LEAST soluble at 60°C?
- At 60°C:
- Solid A: ~120 g
- Solid B: ~85 g
- Solid C: ~40 g

✔ Answer: Solid C

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#### 7. Which Solid is MOST soluble at 60°C?
- From above: Solid A has highest solubility (~120 g)

✔ Answer: Solid A

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#### 8. At what temperature is the solubility of Solid A and Solid B the same?
- Find where the curves for A and B intersect.
- They cross at about 50°C.

✔ Answer: 50°C

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#### 9. Saturated - Unsaturated - Supersaturated: Solution that contains 70g of Solid B at 30°C?
- At 30°C, solubility of Solid B is 65 g/100g water.
- The solution has 70g, which is more than the maximum.
- So it's supersaturated (but unstable — excess may precipitate).

⚠️ However, supersaturated solutions are formed only under special conditions. If we assume this is a real solution, then it's not possible unless it’s metastable.

But since 70g > 65g, and assuming equilibrium:

✔ Answer: Supersaturated

> Note: In some contexts, if excess solid is present, it might be called saturated with undissolved solid. But the question says "solution", so likely assuming all dissolved → supersaturated.

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#### 10. Saturated - Unsaturated - Supersaturated: Solution that contains 110g of Solid A at 70°C?
- At 70°C, Solid A solubility ≈ 140 g/100g water.
- 110g < 140g → less than maximum.
- So it can fully dissolve.

✔ Answer: Unsaturated

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#### 11. How does temperature affect the solubility of solutions?
Options:
a. As temperature increases, solubility decreases
b. As temperature increases, solubility increases
c. As temperature decreases, solubility increases

- For Solid A and B, solubility increases with temperature.
- For Solid C, it stays nearly constant.

But the general trend for most solids (especially these) is that solubility increases with temperature.

So the best general answer is:

✔ Answer: b. As temperature increases, solubility increases

> Note: This is true for many solids, but not all (e.g., gases decrease). But based on this graph, b is correct.

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✔ Final Answers Summary:

| Question | Answer |
|--------|--------|
| 1 | 80 g/100g water |
| 2 | 65 g/100g water |
| 3 | 40 g/100g water |
| 4 | 170 g |
| 5 | 70 g |
| 6 | Solid C |
| 7 | Solid A |
| 8 | 50°C |
| 9 | Supersaturated |
| 10 | Unsaturated |
| 11 | b. As temperature increases, solubility increases |

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Let me know if you'd like a visual explanation or help interpreting the graph further!