Free Osmosis and Tonicity Worksheets for Education - Free Printable

Here is the complete solution to the Osmosis Worksheet, with explanations for each of the 9 diagrams.

---

## 🧬 Key Concepts Recap:

- Osmosis: Water moves across a semi-permeable membrane from an area of higher water concentration (lower solute concentration) to lower water concentration (higher solute concentration).
- Isotonic: Solute concentration inside cell = outside beaker → no net movement of water.
- Hypertonic: Solute concentration outside > inside → water moves OUT of cell → cell shrinks.
- Hypotonic: Solute concentration outside < inside → water moves INTO cell → cell swells.

Also:
> % Water + % Solute = 100%

---

# ✔ SOLUTIONS FOR EACH BEAKER

---

🔹 Beaker 1 (Top Left)

- Cell: 90% H₂O, 10% Solute
- Beaker: 40% H₂O, 60% Solute

✔ Missing %: None

➡️ Water Movement: From cell (90% H₂O) → beaker (40% H₂O)
→ Water moves OUT of cell.

🎯 Solution Type: Hypertonic (beaker has higher solute than cell)

---

🔹 Beaker 2 (Top Middle)

- Cell: 40% H₂O, 60% Solute
- Beaker: 70% H₂O, 30% Solute

✔ Missing %: None

➡️ Water Movement: From beaker (70% H₂O) → cell (40% H₂O)
→ Water moves INTO cell.

🎯 Solution Type: Hypotonic (beaker has lower solute than cell)

---

🔹 Beaker 3 (Top Right)

- Cell: 20% H₂O, 80% Solute
- Beaker: 20% H₂O, 80% Solute

✔ Missing %: None

➡️ Water Movement: No net movement — concentrations equal.

🎯 Solution Type: Isotonic

---

🔹 Beaker 4 (Middle Left)

- Cell: 55% H₂O, 45% Solute
- Beaker: 55% H₂O, ___% Solute

✔ Missing %: 100% - 55% = 45% Solute

➡️ Water Movement: No net movement — same concentrations.

🎯 Solution Type: Isotonic

---

🔹 Beaker 5 (Middle Middle)

- Cell: 15% H₂O, 85% Solute
- Beaker: 35% H₂O, ___% Solute

✔ Missing %: 100% - 35% = 65% Solute

➡️ Water Movement: From beaker (35% H₂O) → cell (15% H₂O)
→ Water moves INTO cell.

🎯 Solution Type: Hypotonic (beaker has lower solute: 65% vs cell’s 85%)

---

🔹 Beaker 6 (Middle Right)

- Cell: ___% H₂O, 95% Solute
- Beaker: 25% H₂O, 75% Solute

✔ Missing % in Cell: 100% - 95% = 5% H₂O

➡️ Water Movement: From beaker (25% H₂O) → cell (5% H₂O)
→ Water moves INTO cell.

🎯 Solution Type: Hypotonic (beaker has lower solute: 75% vs cell’s 95%)

---

🔹 Beaker 7 (Bottom Left)

- Cell: ___% H₂O, 55% Solute → so 45% H₂O
- Beaker: ___% H₂O, 25% Solute → so 75% H₂O

✔ Missing %:
- Cell: 45% H₂O
- Beaker: 75% H₂O

➡️ Water Movement: From beaker (75% H₂O) → cell (45% H₂O)
→ Water moves INTO cell.

🎯 Solution Type: Hypotonic (beaker has lower solute: 25% vs cell’s 55%)

---

🔹 Beaker 8 (Bottom Middle)

- Cell: 80% H₂O, ___% Solute → so 20% Solute
- Beaker: ___% H₂O, 90% Solute → so 10% H₂O

✔ Missing %:
- Cell: 20% Solute
- Beaker: 10% H₂O

➡️ Water Movement: From cell (80% H₂O) → beaker (10% H₂O)
→ Water moves OUT of cell.

🎯 Solution Type: Hypertonic (beaker has higher solute: 90% vs cell’s 20%)

---

🔹 Beaker 9 (Bottom Right)

- Cell: 5% H₂O, ___% Solute → so 95% Solute
- Beaker: 65% H₂O, ___% Solute → so 35% Solute

✔ Missing %:
- Cell: 95% Solute
- Beaker: 35% Solute

➡️ Water Movement: From beaker (65% H₂O) → cell (5% H₂O)
→ Water moves INTO cell.

🎯 Solution Type: Hypotonic (beaker has lower solute: 35% vs cell’s 95%)

---

# 📝 FINAL ANSWER SUMMARY TABLE

| Beaker | Cell H₂O | Cell Solute | Beaker H₂O | Beaker Solute | Water Movement | Solution Type |
|--------|----------|-------------|------------|---------------|---------------------|---------------|
| 1 | 90% | 10% | 40% | 60% | Out of cell | Hypertonic |
| 2 | 40% | 60% | 70% | 30% | Into cell | Hypotonic |
| 3 | 20% | 80% | 20% | 80% | No net movement | Isotonic |
| 4 | 55% | 45% | 55% | 45% | No net movement | Isotonic |
| 5 | 15% | 85% | 35% | 65% | Into cell | Hypotonic |
| 6 | 5% | 95% | 25% | 75% | Into cell | Hypotonic |
| 7 | 45% | 55% | 75% | 25% | Into cell | Hypotonic |
| 8 | 80% | 20% | 10% | 90% | Out of cell | Hypertonic |
| 9 | 5% | 95% | 65% | 35% | Into cell | Hypotonic |

---

## 🖍️ How to Draw Arrows:

- For water moving INTO cell: draw arrow pointing INTO the circle (cell).
- For water moving OUT of cell: draw arrow pointing OUT OF the circle.
- For isotonic: draw double-headed arrow or write “no net movement”.

---

✔ You’re all set! Just fill in the missing percentages and circle the correct solution type for each. Let me know if you’d like a printable version or diagram annotations!

---