NCERT Solutions for Curiosity Chapter 9 The Amazing World of Solutes, Solvents, and Solutions
Updated on 2026-09-05
About this chapter
A uniform mixture — one in which the components are spread evenly and cannot be picked out — is a solution . Salt or sugar in water is a solution; chalk powder, sand or sawdust in water is a non-uniform mixture . When a solid dissolves in a liquid, the solid is the solute and the liquid is the solvent . When two liquids mix, the one present in the smaller amount is the solute. A solution that can still dissolve more solute at that temperature is unsaturated ; once the solute stops dissolving and settles at the bottom, the solution is saturated at that temperature. The amount of solute in a fixed quantity of solution is its concentration (dilute or concentrated); the maximum that dissolves in a fixed quantity (100 mL) of solvent is its solubility . Raising the temperature generally increase
- Chapter opener
- .1 What Are Solute, Solvent, and Solution?
- .2 How Much Solute Can a Fixed Amount of Solvent Dissolve?
- Activity 9.1
- .2.1 How does temperature affect the solubility of a solute?
- Our scientific heritage
- .3 Solubility of Gases
- .5 What Is Density?
- .5.1 Determination of density
- Activity 9.5: Let us measure 50 mL of water
Exercises
- Chapter opener — Probe and ponder Page 134
- .1 What Are Solute, Solvent, and Solution? — In-text Questions Page 1359
- .2 How Much Solute Can a Fixed Amount of Solvent Dissolve? — Activity 9.1: Let us investigate Page 1369
- Activity 9.1 — Some discussion points Page 136
- .2 How Much Solute Can a Fixed Amount of Solvent Dissolve? — In-text Questions Page 1369
- .2 How Much Solute Can a Fixed Amount of Solvent Dissolve? — In-text Questions Page 1379
- .2.1 How does temperature affect the solubility of a solute? — Activity 9.2: Let us experiment (Demonstration activity) Page 1379
- Our scientific heritage — Be a scientist Page 138
- .3 Solubility of Gases — In-text Questions Page 1399
- .4 Why Do Objects Float or Sink in Water? • 9.5 What Is Density? — In-text Questions Page 1409
- .5 What Is Density? — Think like a scientist Page 1419
- .5.1 Determination of density — In-text Questions Page 1439
- .5.1 Determination of density — Activity 9.4: Let us observe and calculate Page 1439
- .5.1 Determination of density — In-text Questions Page 1449
- Activity 9.5: Let us measure 50 mL of water — In-text Questions Page 145
- Determining volume of objects with irregular shapes — Activity 9.7: Let us measure Page 146
- Let us dig deeper! — In-text Questions Page 147
- .5.3 Effect of pressure on density — Ever heard of ... Page 1489
- .5.3 Effect of pressure on density — Think like a scientist Page 1489
- End-of-chapter question set (pages 149–151) — Keep the curiosity alive Page 149
- Science • Society • Interdisciplinary Projects — Discover, design, and debate Page 151