Solubility Curve Worksheet | Summaries Chemistry | Docsity - Free Printable
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Step-by-step solution for: Solubility Curve Worksheet | Summaries Chemistry | Docsity
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Show Answer Key & Explanations
Step-by-step solution for: Solubility Curve Worksheet | Summaries Chemistry | Docsity
Since the image you uploaded contains a Solubility Curve Worksheet, but no actual solubility curve graph is provided in your message, I cannot give exact numerical answers based on a specific graph. However, I can help you solve the worksheet by explaining how to answer each question using a typical solubility curve (such as the standard one found in textbooks, which includes substances like KNO₃, NaCl, NH₄Cl, KClO₃, Ce₂(SO₄)₃, etc.).
Below is a detailed explanation and solution guide for each question, assuming a standard solubility curve is used.
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1. What are the customary units of solubility on solubility curves?
✔ Answer: Grams of solute per 100 grams of water (g/100g H₂O)
📌 *Explanation:* This is the standard unit used on solubility curves.
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2. Define solubility.
✔ Answer: Solubility is the maximum amount of a substance that can dissolve in a given amount of solvent at a specific temperature.
📌 *Explanation:* It's typically expressed in grams of solute per 100 g of water.
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3. According to the graph, the solubility of any substance changes as ________ changes.
✔ Answer: Temperature
📌 *Explanation:* Solubility curves show how solubility varies with temperature.
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4. List the substances whose solubility decreases as temperature increases.
✔ Answer: Cerium(III) sulfate (Ce₂(SO₄)₃), Calcium sulfate (CaSO₄), Calcium hydroxide (Ca(OH)₂)
📌 *Explanation:* These substances have downward-sloping curves. In most standard graphs, Ce₂(SO₄)₃ is the most common example.
> ⚠️ Note: If your graph includes only certain compounds, look for any curve that slopes downward as temperature increases.
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5. Which substance is least affected by temperature changes?
✔ Answer: Sodium chloride (NaCl)
📌 *Explanation:* NaCl has a nearly flat solubility curve — its solubility doesn’t change much with temperature.
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6. How many grams of ammonium chloride (NH₄Cl) at 50°C?
✔ Answer: ~50 g per 100 g water
📌 *Explanation:* At 50°C, the solubility of NH₄Cl is approximately 50 g/100g H₂O (check your graph for precision).
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7. _________ and _________ have the same solubility at approximately 78°C.
✔ Answer: KNO₃ and KClO₃
📌 *Explanation:* On most solubility curves, these two compounds intersect near 78°C.
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8. Which compound is least soluble in water at 10°C?
✔ Answer: Cerium(III) sulfate (Ce₂(SO₄)₃)
📌 *Explanation:* At 10°C, Ce₂(SO₄)₃ has very low solubility (~10–15 g/100g H₂O), much less than others.
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9. How many grams of KNO₃ can be dissolved at 50°C?
✔ Answer: ~85 g per 100 g water
📌 *Explanation:* KNO₃ solubility increases sharply with temperature; at 50°C it’s about 85 g/100g H₂O.
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10. Are the following solutions unsaturated, saturated, or supersaturated?
a. 45g of NaNO₃ in 100 g of water at 30°C.
✔ Answer: Unsaturated
📌 *Explanation:* At 30°C, solubility of NaNO₃ ≈ 95 g/100g H₂O → 45 g < 95 g → Unsaturated
b. 60g of KClO₃ in 100 g of water at 60°C.
✔ Answer: Saturated
📌 *Explanation:* At 60°C, solubility of KClO₃ ≈ 60 g/100g H₂O → 60 g = max → Saturated
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11. How many grams of sodium chloride (NaCl) are required to saturate 100 grams of water at 100°C?
✔ Answer: ~39 g
📌 *Explanation:* NaCl solubility is ~39 g/100g H₂O at 100°C (slightly higher than at 20°C, but not much).
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12. How many grams of NaNO₃ are required to saturate 100 grams of water at 90°C?
✔ Answer: ~150 g
📌 *Explanation:* NaNO₃ solubility at 90°C is around 150 g/100g H₂O.
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13. How many grams of KI will saturate water at 20°C?
✔ Answer: ~50 g
📌 *Explanation:* KI solubility at 20°C is about 50 g/100g H₂O.
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14. At what temperature would 25g of potassium chlorate (KClO₃) dissolve?
✔ Answer: ~30°C
📌 *Explanation:* Find where the KClO₃ curve intersects 25 g → occurs at ~30°C.
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15. At what temperature would 55g of NH₄Cl dissolve?
✔ Answer: ~60°C
📌 *Explanation:* NH₄Cl solubility reaches ~55 g/100g H₂O at ~60°C.
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16. 89 g NaNO₃ is prepared at 30°C.
a) Will all of the salt dissolve?
✔ Answer: No
📌 *Explanation:* At 30°C, solubility of NaNO₃ ≈ 95 g/100g H₂O → 89 g < 95 g → Yes, it will dissolve!
Wait — correction: 89 g < 95 g → Yes, all will dissolve.
So: ✔ Answer: Yes
b) What mass of NaNO₃ will dissolve at this temperature?
✔ Answer: 95 g
📌 *Explanation:* The maximum solubility at 30°C is 95 g/100g H₂O.
> ❗ But since only 89 g is added, all 89 g will dissolve.
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17. If 25 grams of NH₄Cl is dissolved at 50°C, how many additional grams NH₄Cl would be needed to make the solution saturated at 80°C?
Step-by-step:
- At 50°C: solubility ≈ 50 g → already 25 g dissolved
- At 80°C: solubility ≈ 65 g
- So, need 65 g total → already have 25 g → need 40 more grams
✔ Answer: 40 g
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18. At 50°C, how many grams of KNO₃ will dissolve?
✔ Answer: ~85 g
📌 *Explanation:* Standard value from solubility curve.
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19. At 70°C, how many grams of cerium(III) sulfate (Ce₂(SO₄)₃) will dissolve?
✔ Answer: ~10 g
📌 *Explanation:* Ce₂(SO₄)₃ solubility decreases with temperature; at 70°C it's about 10 g/100g H₂O.
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20. Determine if each of the following is unsaturated, saturated, or supersaturated.
We'll use approximate values:
| Substance | Temp | Given Mass | Max Solubility | Status |
|---------|------|------------|----------------|--------|
| a. NH₃ at 20°C | 20°C | 55 g | ~90 g | Unsaturated |
| b. Ce₂(SO₄)₃ at 10°C | 10°C | 10 g | ~15 g | Unsaturated |
| c. KNO₃ at 60°C | 60°C | 125 g | ~110 g | Supersaturated |
| d. NH₄Cl at 80°C | 80°C | 65 g | ~65 g | Saturated |
| e. NH₃ at 90°C | 90°C | 12 g | ~50 g | Unsaturated |
| f. NaNO₃ at 10°C | 10°C | 80 g | ~80 g | Saturated |
| g. NaNO₃ at 80°C | 80°C | 145 g | ~150 g | Unsaturated |
| h. NaCl at 100°C | 100°C | 35 g | ~39 g | Unsaturated |
✔ Final Answers:
- a. Unsaturated
- b. Unsaturated
- c. Supersaturated
- d. Saturated
- e. Unsaturated
- f. Saturated
- g. Unsaturated
- h. Unsaturated
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- Solubility curves show how much solute dissolves in 100 g of water at various temperatures.
- Upward slope: Solubility increases with temperature (most solids).
- Downward slope: Solubility decreases with temperature (e.g., Ce₂(SO₄)₃).
- Unsaturated: Less solute than max possible.
- Saturated: Exactly at max solubility.
- Supersaturated: More than max — unstable, usually formed by cooling slowly.
---
⚠️ Important Note: Your actual answers may vary slightly depending on the specific solubility curve graph you were given. Always refer to your graph for precise values.
If you can describe the graph or provide data points (e.g., "At 50°C, KNO₃ is 85 g"), I can tailor answers exactly to your version.
Let me know if you'd like this formatted as a printable answer key!
Below is a detailed explanation and solution guide for each question, assuming a standard solubility curve is used.
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🔹 Solubility Curve Worksheet – Answers & Explanations
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1. What are the customary units of solubility on solubility curves?
✔ Answer: Grams of solute per 100 grams of water (g/100g H₂O)
📌 *Explanation:* This is the standard unit used on solubility curves.
---
2. Define solubility.
✔ Answer: Solubility is the maximum amount of a substance that can dissolve in a given amount of solvent at a specific temperature.
📌 *Explanation:* It's typically expressed in grams of solute per 100 g of water.
---
3. According to the graph, the solubility of any substance changes as ________ changes.
✔ Answer: Temperature
📌 *Explanation:* Solubility curves show how solubility varies with temperature.
---
4. List the substances whose solubility decreases as temperature increases.
✔ Answer: Cerium(III) sulfate (Ce₂(SO₄)₃), Calcium sulfate (CaSO₄), Calcium hydroxide (Ca(OH)₂)
📌 *Explanation:* These substances have downward-sloping curves. In most standard graphs, Ce₂(SO₄)₃ is the most common example.
> ⚠️ Note: If your graph includes only certain compounds, look for any curve that slopes downward as temperature increases.
---
5. Which substance is least affected by temperature changes?
✔ Answer: Sodium chloride (NaCl)
📌 *Explanation:* NaCl has a nearly flat solubility curve — its solubility doesn’t change much with temperature.
---
6. How many grams of ammonium chloride (NH₄Cl) at 50°C?
✔ Answer: ~50 g per 100 g water
📌 *Explanation:* At 50°C, the solubility of NH₄Cl is approximately 50 g/100g H₂O (check your graph for precision).
---
7. _________ and _________ have the same solubility at approximately 78°C.
✔ Answer: KNO₃ and KClO₃
📌 *Explanation:* On most solubility curves, these two compounds intersect near 78°C.
---
8. Which compound is least soluble in water at 10°C?
✔ Answer: Cerium(III) sulfate (Ce₂(SO₄)₃)
📌 *Explanation:* At 10°C, Ce₂(SO₄)₃ has very low solubility (~10–15 g/100g H₂O), much less than others.
---
9. How many grams of KNO₃ can be dissolved at 50°C?
✔ Answer: ~85 g per 100 g water
📌 *Explanation:* KNO₃ solubility increases sharply with temperature; at 50°C it’s about 85 g/100g H₂O.
---
10. Are the following solutions unsaturated, saturated, or supersaturated?
a. 45g of NaNO₃ in 100 g of water at 30°C.
✔ Answer: Unsaturated
📌 *Explanation:* At 30°C, solubility of NaNO₃ ≈ 95 g/100g H₂O → 45 g < 95 g → Unsaturated
b. 60g of KClO₃ in 100 g of water at 60°C.
✔ Answer: Saturated
📌 *Explanation:* At 60°C, solubility of KClO₃ ≈ 60 g/100g H₂O → 60 g = max → Saturated
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11. How many grams of sodium chloride (NaCl) are required to saturate 100 grams of water at 100°C?
✔ Answer: ~39 g
📌 *Explanation:* NaCl solubility is ~39 g/100g H₂O at 100°C (slightly higher than at 20°C, but not much).
---
12. How many grams of NaNO₃ are required to saturate 100 grams of water at 90°C?
✔ Answer: ~150 g
📌 *Explanation:* NaNO₃ solubility at 90°C is around 150 g/100g H₂O.
---
13. How many grams of KI will saturate water at 20°C?
✔ Answer: ~50 g
📌 *Explanation:* KI solubility at 20°C is about 50 g/100g H₂O.
---
14. At what temperature would 25g of potassium chlorate (KClO₃) dissolve?
✔ Answer: ~30°C
📌 *Explanation:* Find where the KClO₃ curve intersects 25 g → occurs at ~30°C.
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15. At what temperature would 55g of NH₄Cl dissolve?
✔ Answer: ~60°C
📌 *Explanation:* NH₄Cl solubility reaches ~55 g/100g H₂O at ~60°C.
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16. 89 g NaNO₃ is prepared at 30°C.
a) Will all of the salt dissolve?
✔ Answer: No
📌 *Explanation:* At 30°C, solubility of NaNO₃ ≈ 95 g/100g H₂O → 89 g < 95 g → Yes, it will dissolve!
Wait — correction: 89 g < 95 g → Yes, all will dissolve.
So: ✔ Answer: Yes
b) What mass of NaNO₃ will dissolve at this temperature?
✔ Answer: 95 g
📌 *Explanation:* The maximum solubility at 30°C is 95 g/100g H₂O.
> ❗ But since only 89 g is added, all 89 g will dissolve.
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17. If 25 grams of NH₄Cl is dissolved at 50°C, how many additional grams NH₄Cl would be needed to make the solution saturated at 80°C?
Step-by-step:
- At 50°C: solubility ≈ 50 g → already 25 g dissolved
- At 80°C: solubility ≈ 65 g
- So, need 65 g total → already have 25 g → need 40 more grams
✔ Answer: 40 g
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18. At 50°C, how many grams of KNO₃ will dissolve?
✔ Answer: ~85 g
📌 *Explanation:* Standard value from solubility curve.
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19. At 70°C, how many grams of cerium(III) sulfate (Ce₂(SO₄)₃) will dissolve?
✔ Answer: ~10 g
📌 *Explanation:* Ce₂(SO₄)₃ solubility decreases with temperature; at 70°C it's about 10 g/100g H₂O.
---
20. Determine if each of the following is unsaturated, saturated, or supersaturated.
We'll use approximate values:
| Substance | Temp | Given Mass | Max Solubility | Status |
|---------|------|------------|----------------|--------|
| a. NH₃ at 20°C | 20°C | 55 g | ~90 g | Unsaturated |
| b. Ce₂(SO₄)₃ at 10°C | 10°C | 10 g | ~15 g | Unsaturated |
| c. KNO₃ at 60°C | 60°C | 125 g | ~110 g | Supersaturated |
| d. NH₄Cl at 80°C | 80°C | 65 g | ~65 g | Saturated |
| e. NH₃ at 90°C | 90°C | 12 g | ~50 g | Unsaturated |
| f. NaNO₃ at 10°C | 10°C | 80 g | ~80 g | Saturated |
| g. NaNO₃ at 80°C | 80°C | 145 g | ~150 g | Unsaturated |
| h. NaCl at 100°C | 100°C | 35 g | ~39 g | Unsaturated |
✔ Final Answers:
- a. Unsaturated
- b. Unsaturated
- c. Supersaturated
- d. Saturated
- e. Unsaturated
- f. Saturated
- g. Unsaturated
- h. Unsaturated
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✔ Summary of Key Concepts:
- Solubility curves show how much solute dissolves in 100 g of water at various temperatures.
- Upward slope: Solubility increases with temperature (most solids).
- Downward slope: Solubility decreases with temperature (e.g., Ce₂(SO₄)₃).
- Unsaturated: Less solute than max possible.
- Saturated: Exactly at max solubility.
- Supersaturated: More than max — unstable, usually formed by cooling slowly.
---
⚠️ Important Note: Your actual answers may vary slightly depending on the specific solubility curve graph you were given. Always refer to your graph for precise values.
If you can describe the graph or provide data points (e.g., "At 50°C, KNO₃ is 85 g"), I can tailor answers exactly to your version.
Let me know if you'd like this formatted as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of solubility curves worksheet answers.
![Kami Export - Carlo Zapata - [WS] Solubility Curves 2 - SOLUBILITY ...](/images2/solubility-curves-worksheet-answers/solubility-curves-worksheet-answers-26.png)
