Saturated
Saturation when no more solute dissolves.
Saturated
Saturated Solutions
What you'll learn
- A solution is saturated when no more solute dissolves at that temperature — extra settles at bottom.
- Unsaturated holds less than maximum; supersaturated is advanced (Class 5 mention only).
- Temperature often affects how much dissolves — hot water dissolves more sugar (making chashni).
- NCERT Looking Around 5, Chapter 7 — keep adding salt until it stops dissolving.
Key concepts
Level 1 — Saturation
Verbal: If you keep adding sugar to cold water, eventually sugar crystals remain undissolved — the solution is saturated.
Symbolic: At saturation: dissolve rate = crystallisation rate (dynamic equilibrium intro).
| State | Description | Visual |
|---|---|---|
| Unsaturated | Can dissolve more | No solid at bottom |
| Saturated | Maximum dissolved | Solid may remain |
| Dilute vs concentrated | Relative amount of solute | Weak tea vs strong tea |
NCERT link: Ch 7 — experiment adding salt/spoon by spoon.
Level 2 — Temperature and real cooking
Verbal: Warm solvent usually dissolves more solute; cooling can cause crystals to form (rock candy intro).
Real-life: Making jaggery syrup; oversweet chai with sugar at bottom on cold day.
| Change | Effect |
|---|---|
| Heat water | More sugar/salt dissolves |
| Cool saturated sugar water | Extra sugar may crystallise |
| Stirring | Speeds dissolving, does not change max amount much |
Worked example
You add 5 spoons sugar; all dissolve. Add 6th — some remains. Describe solution.
Step 1 — First 5 spoons fully dissolved → was unsaturated until limit.
Step 2 — 6th spoon remains → saturated at this temperature.
Answer: Saturated sugar solution with excess sugar at bottom.
Can you dissolve more salt in hot water than cold (same amount of water)?
Step 1 — Heat increases solubility of most solids in water.
Step 2 — Hot water holds more salt before saturating.
Answer: Yes — generally more in hot water.
Common mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
| Saturation = any visible solute | Undissolved always means saturated | Must be at maximum dissolved |
| Stirring dissolves unlimited sugar | Confuses rate with capacity | Stirring helps speed, not infinite amount |
| Saturation same at all temperatures | Ignoring heat effect | Temperature changes saturation level |
| Clear water cannot be saturated | Expect cloudiness | Saturated salt water can still look clear |
Quick check
- Define saturated solution.
- What might you see at bottom of saturated sugar water?
- Unsaturated vs saturated — one difference.
- Stretch: Why does jaggery syrup use hot water when making sweets?
Revision tip: Repeat Ch 7 salt experiment — count spoons until crystals remain; record number for cold vs warm water if safe at home.
Open the Practice tab for graded questions on Saturated Solutions.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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