Osmosis Worksheet: Practice Problems & Real-World Application

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To help you solve the problems on this worksheet, I’ll explain the core concepts of osmosis and how to approach typical osmosis problems, especially those involving animal cells and solution concentrations. Then, I can guide you through solving common types of problems found on such worksheets.

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🔬 Understanding Osmosis

Osmosis is the movement of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Key terms:
- Hypotonic: Lower solute concentration outside the cell → Water enters the cell → Cell swells (animal cells may burst).
- Hypertonic: Higher solute concentration outside the cell → Water leaves the cell → Cell shrinks.
- Isotonic: Equal solute concentration inside and outside → No net movement of water.

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🧪 Typical Problems on This Worksheet

#### Part One: Diagrams of Animal Cells in Solutions
Each diagram shows an animal cell in a beaker with a certain % water and solute.

Steps to Solve:

1. Compare solute concentrations inside the cell vs. outside.
2. Determine direction of water movement:
- Water moves toward higher solute concentration.
3. Draw arrow into or out of the cell accordingly.
4. Label the solution type (isotonic, hypertonic, hypotonic).

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#### ✔ Example Problem:

Beaker 1:
- Inside cell: 70% water, 30% salt
- Outside: 95% water, 5% salt

Step-by-step:
- Outside has more water (95%) → less solute → hypotonic solution.
- Water will move into the cell.
- Arrow: Into the cell.
- Solution type: Hypotonic.

✔ Answer:
- Arrow: Into the cell
- Type: Hypotonic

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Beaker 2:
- Inside cell: 70% water, 30% salt
- Outside: 60% water, 40% salt

- Outside has higher solute → hypertonic
- Water moves out of the cell
- Arrow: Out of the cell
- Type: Hypertonic

✔ Answer:
- Arrow: Out of the cell
- Type: Hypertonic

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Beaker 3:
- Inside: 70% water, 30% salt
- Outside: 70% water, 30% salt

→ Equal concentrations → No net movement
→ Arrow: "No net movement"
→ Type: Isotonic

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🔍 Real-World Application Examples

1. IV Fluids for Patients:
- Normal saline (0.9% NaCl) is isotonic to blood → prevents red blood cells from swelling or shrinking.
- If a patient gets hypotonic fluid (like distilled water), RBCs swell and burst.
- Hypertonic solutions draw water out of cells — used to treat brain swelling.

2. Why do we use salt to preserve food?
- Salt creates a hypertonic environment → draws water out of bacteria → kills them.

3. Why do plants wilt in salty soil?
- Soil becomes hypertonic → water leaves plant roots → wilting.

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📌 Tips for Solving Osmosis Problems:

1. Always compare water percentage or solute percentage.
2. Remember: Water moves toward higher solute concentration.
3. For animal cells:
- Hypotonic → Swell / burst
- Hypertonic → Shrink / crenate
- Isotonic → No change

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🧩 Sample Worksheet Question (Based on Common Types)

> A red blood cell is placed in a solution that is 99.3% water and 0.7% salt. The cell’s interior is 90% water and 10% salt.
>
> a) Draw an arrow showing water movement.
> b) What happens to the cell?
> c) Is the solution hypotonic, hypertonic, or isotonic?

Solution:
- Outside: 99.3% water → very low solute
- Inside: 90% water → high solute
- So, water moves into the cell → hypotonic
- Arrow: Into the cell
- Cell: Swells and may burst
- Solution: Hypotonic

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💡 Final Advice:

If you can provide:
- Specific diagrams or percentages from the worksheet,
- Or transcribe the exact questions,

I can give you detailed answers tailored to your worksheet.

Would you like to share the details of one of the problems so I can walk you through it step by step?