How soluble is it? | 5th grade Science Worksheet | GreatSchools - Free Printable

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🔬 Worksheet: How Soluble Is It?

#### 📚 Background Knowledge:
> All solids substances do not dissolve equally well. Sugar dissolves very easily, while other substances, such as salt, dissolve less easily. The amount of a substance that will dissolve in a solvent is a measure of its solubility.

This introduces the concept of solubility – how much of a solid can dissolve in a liquid (like water).

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✔ Science Activity

Task:
Predict and test the solubility of different substances.

#### 1. Observe the pictures (4 beakers with different amounts of dissolved solids):
- Beaker A: Clear liquid → No solid visible
- Beaker B: Slight cloudiness → Some undissolved particles
- Beaker C: More visible particles → Less dissolved
- Beaker D: Many undissolved particles → Very little dissolved

Question: *Which substance is most soluble?*

👉 Answer: Beaker A shows complete dissolution → Substance in Beaker A is the most soluble.

Why? Because all of it dissolved in the water.

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#### 2. Predict what happens when more sugar/salt is added:
- More sugar in water? → It may continue to dissolve until saturation point.
- More salt in water? → Same – up to a point (saturation), then no more dissolves.

✔ Answer:
> Yes, more sugar and salt can dissolve up to a limit. Once saturated, excess will not dissolve.

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#### 3. Compare solubility:
> "Another substance is more soluble than salt but less soluble than sugar."

👉 So, sugar > X > salt in solubility.

Question: What might this substance be?

✔ Example answer:
> Cocoa powder, baking soda, or citric acid – these are moderately soluble, more than salt but less than sugar.

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#### 4. Rank order of solubility:
List the substances from most soluble to least soluble.

Assuming the substances tested are:
- Sugar
- Salt
- Sand
- Flour
- Baking powder

✔ Order (most to least soluble):
1. Sugar (highly soluble)
2. Salt (moderately soluble)
3. Baking powder (partially soluble)
4. Flour (slightly soluble, forms suspension)
5. Sand (insoluble)

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🔍 Science Investigation

> Do the size of sugar particles affect solubility?

#### Hypothesis:
> Smaller particles dissolve faster because they have more surface area exposed to water.

#### Design an experiment:
Variables:
- Independent variable: Size of sugar particles (e.g., granulated vs. powdered sugar)
- Dependent variable: Time taken to dissolve
- Controlled variables: Amount of sugar, volume of water, temperature, stirring speed

#### Steps:
1. Measure equal masses of granulated sugar and powdered sugar.
2. Add each to equal volumes of warm water in separate beakers.
3. Stir both at the same rate and time.
4. Record how long it takes for each to fully dissolve.

#### Expected Result:
> Powdered sugar dissolves faster than granulated sugar.

#### Conclusion:
> Particle size affects rate of dissolution, but not necessarily maximum solubility. Smaller particles dissolve quicker due to increased surface area.

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✔ Final Answers Summary:

| Question | Answer |
|--------|--------|
| Which substance is most soluble? | The one in Beaker A (fully dissolved) |
| Can more sugar/salt dissolve? | Yes, up to saturation point |
| Substance more soluble than salt, less than sugar? | Example: baking soda or citric acid |
| Order of solubility (most to least): | Sugar > Salt > Baking powder > Flour > Sand |
| Does particle size affect solubility? | Yes – smaller particles dissolve faster |

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💡 Key Concepts:

- Solubility = maximum amount of solid that can dissolve in a solvent.
- Saturation = when no more solid can dissolve.
- Particle size affects speed of dissolving, not total solubility.
- Stirring, temperature, and surface area influence dissolution rate.

Let me know if you'd like a printable version of this explanation or help designing the experiment!