Solubility and Concentration worksheet for chemistry students, featuring matching, true/false, and calculation questions.

Here’s the complete solution to the “Solubility and Concentration” worksheet, with clear explanations for each question.

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1. Match the following. Write the correct letter in the blank provided.

| Term | Definition | Answer |
|-------------|----------------------------------------------------------------------------|--------|
| 1. Solute | B. The part that dissolves into the solution | B |
| 2. Solvent | E. The part that dissolves something | E |
| 3. Dissolve | D. When something is seen to disappear inside the solvent | D |
| 4. Stirring | C. Increase solubility by moving molecules faster | C |
| 5. Concentration | A. Tells you how much solute is dissolved in the solution | A |

✔ Explanation:
- Solute = substance being dissolved (e.g., sugar in tea).
- Solvent = substance doing the dissolving (e.g., water in tea).
- Dissolve = process where solute disappears into solvent.
- Stirring = speeds up dissolution by increasing molecular motion.
- Concentration = measure of how much solute is in a given amount of solvent/solution.

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2. Determine if the following statements are true or false.

a. Solubility increases if you stir a solute into a solution. → False
> *Stirring speeds up the rate of dissolving but does NOT change the maximum solubility (which depends on temperature and pressure).*

b. All solutes have the same solubility in a given solvent. → False
> *Different substances dissolve to different extents — e.g., sugar dissolves well in water, but sand does not.*

c. There is a limit on the amount of solute that can dissolve in a given solvent. → True
> *This is called saturation — once the solvent can’t hold more solute, it’s saturated.*

d. You can dissolve additional solutes in an unsaturated solution. → True
> *Unsaturated means more solute can still dissolve until saturation is reached.*

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3. Give three ways to make sugar dissolve faster.

✔ Answers:
- Stirring – increases contact between sugar and water molecules.
- Heating the water – higher temperature increases molecular motion and solubility.
- Crushing/grinding sugar into smaller particles – increases surface area exposed to solvent.

*(Other acceptable answers: using powdered sugar, increasing agitation, etc.)*

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4. Which one will dissolve faster? Circle the correct answer.

a. Powdered sugar or granulated sugar? → Powdered sugar
> *Smaller particles = larger surface area = faster dissolving.*

b. In hot water or in cold water? → Hot water
> *Higher temperature = faster molecular motion = faster dissolving.*

c. Stirred or not stirred? → Stirred
> *Stirring brings fresh solvent into contact with solute.*

d. Large particles or small particles? → Small particles
> *Again, more surface area = faster dissolution.*

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5. 65 g of sugar is dissolved in 750 mL of water. What is the concentration of the solution?

✔ Formula:
Concentration = mass of solute / volume of solvent (in mL)
→ Units: g/mL

Calculation:
65 g ÷ 750 mL = 0.0867 g/mL

✔ Answer: 0.087 g/mL (rounded to 3 significant figures)

*(Note: Sometimes concentration is expressed as g/100mL — then it would be 8.67 g/100mL — but since no unit is specified, g/mL is standard here.)*

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6. Which is more concentrated: 34 g of salt dissolved in 100 mL of water OR 100 g of salt in 1500 mL of water?

✔ Calculate both concentrations in g/mL:

- First solution: 34 g / 100 mL = 0.34 g/mL
- Second solution: 100 g / 1500 mL ≈ 0.0667 g/mL

✔ Answer: 34 g in 100 mL is more concentrated.

*(It has a much higher mass per unit volume.)*

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7. If the solubility of salt in water was determined to be 0.5 g/mL, would a solution with 50 g of salt in 150 mL of water be considered saturated?

✔ Step 1: Calculate maximum salt that can dissolve in 150 mL.
Solubility = 0.5 g/mL
→ Max solute = 0.5 g/mL × 150 mL = 75 g

✔ Step 2: Compare actual solute (50 g) to max (75 g)
Since 50 g < 75 g → the solution is unsaturated.

✔ Answer: No, it is NOT saturated — it can still dissolve more salt.

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## ✔ Final Answers Summary:

1. Matching:
1. B
2. E
3. D
4. C
5. A

2. True/False:
a. False
b. False
c. True
d. True

3. Three ways to dissolve sugar faster:
Stirring, Heating, Crushing (or increasing surface area)

4. Faster dissolving:
a. Powdered sugar
b. Hot water
c. Stirred
d. Small particles

5. Concentration: 0.087 g/mL

6. More concentrated: 34 g in 100 mL

7. Saturated? No — it’s unsaturated.

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