Solute Solvent
Solutions; solute dissolved in solvent.
Solute Solvent
Solute and Solvent
What you'll learn
- A solution forms when a solute dissolves in a solvent.
- In sugar water: sugar = solute, water = solvent — water is called the universal solvent (Class 5 intro).
- Difference between solution, suspension, and mixture (simple level).
- NCERT Looking Around 5, Chapter 7 (Experiments with Water) — salt/sugar dissolving experiments.
Key concepts
Level 1 — Parts of a solution
Verbal: The substance that dissolves is the solute; the liquid that does the dissolving is the solvent.
Symbolic: Solute + Solvent → Solution (homogeneous mixture).
| Example | Solute | Solvent | Solution |
|---|---|---|---|
| Sweet lemonade | Sugar, lemon juice | Water | Lemonade |
| Saline (intro) | Salt | Water | Salt water |
| ORS packet | Salts, sugar | Water | ORS drink |
NCERT link: Ch 7 — stirring salt till it "disappears" (dissolves).
Level 2 — Dissolving and concentration (intro)
Verbal: Stirring and warming often speed dissolving; only so much solute can dissolve before saturation.
Real-life: Nimbu pani; tea with sugar; paint pigments in water (some stay suspended).
| Term | Meaning |
|---|---|
| Dissolve | Solute particles spread evenly in solvent |
| Insoluble | Does not dissolve (sand in water) |
| Miscible liquids | Mix completely (water + vinegar intro) |
Worked example
Identify solute and solvent in tamarind water.
Step 1 — Tamarind pulp dissolves partly → solute (tamarind).
Step 2 — Water does dissolving → solvent.
Answer: Solute — tamarind; Solvent — water.
Chalk powder in water — solution?
Step 1 — Chalk does not dissolve; settles at bottom.
Step 2 — Heterogeneous mixture / suspension, not true solution.
Answer: Not a solution — insoluble solid in water.
Common mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
| Solute always solid | Liquid-in-liquid exists | Alcohol in water — both liquids; larger amount often solvent |
| Dissolving = disappearing | Particles too small to see | Matter still there — evenly spread |
| Any mixed substances = solution | Milk is emulsion (intro) | True solution is clear homogeneous (salt water) |
| Solvent always water | Other solvents exist | Class 5 focus: water most common |
Quick check
- Define solute and solvent.
- In ORS, name likely solute and solvent.
- Does sand form a solution in water?
- Stretch: Why do we stir sugar into tea?
Revision tip: Make salt water and chalk water side by side — observe clear vs cloudy; label solute/solvent on each cup.
Open the Practice tab for graded questions on Solute and Solvent.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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