Solutions — Class 11 Chemistry (Samacheer Kalvi)
TN State Board (Samacheer Kalvi) Class 11 Chemistry, Chapter 9. Concentration units, colligative properties and osmosis.
1. About this chapter
This chapter covers Solutions as part of the Class 11 Samacheer Kalvi Chemistry curriculum. It deals with concentration units, colligative properties and osmosis and builds conceptual understanding essential for the TN HSC Public Exam.
By the end of this chapter, students will be able to:
- Express concentration as molarity and molality
- Explain elevation of boiling point and depression of freezing point
2. Key concepts
- Concept 1: Express concentration as molarity and molality.
- Concept 2: Explain elevation of boiling point and depression of freezing point.
3. Important terms and formulas
| Term / Formula | Description |
|---|---|
| Express concentration as molarity… | Express concentration as molarity and molality |
| Explain elevation of boiling… | Explain elevation of boiling point and depression of freezing point |
4. Worked examples
Example 1. Applying a key concept from this chapter.
Solution: Identify the relevant principle → apply the formula or rule → state the answer with correct units.
Example 2. A typical exam-style question on solutions.
Solution: Break the problem into steps, use the appropriate formula and verify the answer.
5. Common mistakes
- Mistake: Skipping units or forgetting to state them. Fix: Always write units alongside every quantity and answer.
- Mistake: Confusing similar terms or concepts in this chapter. Fix: Make a comparison table of the terms during revision.
6. Practice (exam-style)
- Define the main term or principle covered in Chapter 9.
- Give two real-life examples related to solutions.
- Solve a short numerical or descriptive question from this chapter.
- State one important formula and explain each symbol.
7. Answer key (hints)
- Refer to section 2 (Key concepts) above for the definition.
- Examples should be drawn from daily experience and local context.
- Apply the formula from section 3, show all steps clearly.
- Formula with units — refer to the textbook glossary for symbol meanings.
8. Quick revision
- Class 11 Chemistry — Chapter 9: Solutions.
- Core idea: Concentration units, colligative properties and osmosis.
- Key outcomes: Express concentration as molarity and molality; Explain elevation of boiling point and depression of freezing point.
- Always revise diagrams / tables from the Samacheer Kalvi textbook before the exam.
