Solubility Curve Graph worksheet - Free Printable

Here is the step-by-step solution to all 11 questions based on the provided solubility curve graph.

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1. What is the Solubility of Solid A at 40°C?

- Find 40°C on the x-axis (Temperature).
- Move vertically up until you hit the curve for Solid A.
- Move horizontally left to read the y-axis (Solubility in g per 100g of water).
- At 40°C, Solid A’s solubility is 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?

- Locate 30°C on the x-axis.
- Move up to the Solid B curve.
- Move left to the y-axis.
- The value is approximately 60 g per 100g of water.

✔ Answer: 60 g/100g water

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3. What is the Solubility of Solid C at 60°C?

- Find 60°C on the x-axis.
- Move up to the Solid C curve — notice it’s a flat horizontal line.
- Read the y-value — it’s constant at 40 g per 100g of water, regardless of temperature.

✔ Answer: 40 g/100g water

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4. How much of Solid A will dissolve in 100g of water at 80°C?

- Go to 80°C on the x-axis.
- Move up to the Solid A curve.
- Read the y-value — it’s about 160 g per 100g of water.

✔ Answer: 160 g

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5. How much of Solid B will dissolve in 100g of water at 40°C?

- At 40°C, go up to the Solid B curve.
- Read the y-value — it’s approximately 70 g per 100g of 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 ≈ 90 g
- Solid C = 40 g
- Solid C has the lowest solubility.

✔ Answer: Solid C

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7. Which Solid is MOST soluble at 60°C?

- From above:
- Solid A ≈ 120 g → highest
- Solid B ≈ 90 g
- Solid C = 40 g

✔ Answer: Solid A

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8. At what temperature is the solubility of Solid A and Solid B the same?

- Look for the point where the curves for Solid A and Solid B intersect.
- This occurs at approximately 50°C.
- At this point, both have a solubility of about 80 g per 100g water.

✔ Answer: 50°C

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9. Saturated - Unsaturated - Supersaturated: Solution that contains 70g of Solid B at 30°C?

- First, find the solubility of Solid B at 30°C → from Q2, it’s 60 g/100g water.
- The solution contains 70g — which is more than the maximum that can dissolve at that temperature.
- Therefore, it is supersaturated (if stable) or would precipitate excess solid.

✔ Answer: Supersaturated

*(Note: Technically, if 70g is dissolved without precipitation, it’s supersaturated; if excess solid is present, it’s saturated with undissolved solute. But since the question says “contains 70g”, we assume it’s fully dissolved beyond saturation.)*

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10. Saturated - Unsaturated - Supersaturated: Solution that contains 110g of Solid A at 70°C?

- Find solubility of Solid A at 70°C → approximately 140 g/100g water.
- The solution contains 110g, which is less than 140g.
- So, it can still dissolve more → unsaturated.

✔ Answer: Unsaturated

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11. How does temperature affect the solubility of solutions?

- Looking at the graph:
- Solid A and Solid B: solubility increases as temperature increases.
- Solid C: solubility stays constant.
- Since most solids show increasing solubility with temperature, and the question likely refers to general behavior (as seen in A and B), the correct answer is:

✔ Answer: b. As temperature increases, solubility increases

*(Note: For gases, solubility usually decreases with temperature, but here all are solids, so option b is correct.)*

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## ✔ Final Answers Summary:

1. 80 g/100g water
2. 60 g/100g water
3. 40 g/100g water
4. 160 g
5. 70 g
6. Solid C
7. Solid A
8. 50°C
9. Supersaturated
10. Unsaturated
11. b. As temperature increases, solubility increases

Let me know if you’d like a visual guide or further explanation!