SCIENCE IMPORTANT FORMULAE CLASS - 9
Important Formulae for class 9 science
Updated for new syllabus - 2026
Class 9 science Important Formulae
The Important Science Formulae section at Saraswat Academy provides a complete collection of chapter-wise scientific formulas based on the latest CBSE Syllabus 2026–27. These formulas are carefully selected from the NCERT textbooks and presented in a simple, easy-to-understand format for quick learning and revision. They help students strengthen their conceptual understanding, solve numerical problems accurately, and improve problem-solving speed in Physics, Chemistry, and other formula-based topics. Regular practice of these formulas is essential for homework, class tests, unit tests, practical examinations, half-yearly examinations, annual examinations, and CBSE board examinations. This page serves as a quick revision resource, enabling students to recall important formulas confidently and perform better in both school and competitive examinations.
Regular revision of scientific formulas helps students strengthen conceptual understanding, improve numerical problem-solving skills, and reduce errors in calculations during examinations. Whether you are preparing for school assessments, practical examinations, or CBSE board exams, these chapter-wise science formula sheets provide a quick and effective revision resource. Students are encouraged to practise these formulas alongside NCERT questions, exemplar problems, practical-based questions, competency-based questions, and previous years' board questions to develop scientific reasoning, enhance accuracy, and achieve excellent marks in Science.
Important Formulae: Science Class - 9
Chapter - 5
Important Formulae - Chapter 5: Exploring Mixtures and their Separation
1. Mass by Mass Percentage (% m/m or % w/w)
Formula
Mass by Mass Percentage = (Mass of Solute ÷ Mass of Solution) × 100
Symbol Form
% m/m = (Mass of Solute / Mass of Solution) × 100
Mass of Solution = Mass of Solute + Mass of Solvent
2. Mass by Volume Percentage (% m/v or % w/v)
Formula
Mass by Volume Percentage = (Mass of Solute ÷ Volume of Solution) × 100
Symbol Form
% m/v = (Mass of Solute / Volume of Solution) × 100
3. Volume by Volume Percentage (% v/v)
Formula
Volume by Volume Percentage = (Volume of Solute ÷ Volume of Solution) × 100
Symbol Form
% v/v = (Volume of Solute / Volume of Solution) × 100
4. Mass of Solution
Mass of Solution = Mass of Solute + Mass of Solvent
Important Definitions (Useful in Numericals)
| Term | Meaning |
|---|---|
| Solubility | Maximum amount of solute that dissolves in 100 g or 100 mL of solvent at a given temperature. |
| Saturated Solution | A solution that cannot dissolve more solute at a given temperature. |
| Concentration | Amount of solute present in a given amount of solvent or solution. |
Quick Revision Formulae
- % m/m = (Mass of Solute ÷ Mass of Solution) × 100
- Mass of Solution = Mass of Solute + Mass of Solvent
- % m/v = (Mass of Solute ÷ Volume of Solution) × 100
- % v/v = (Volume of Solute ÷ Volume of Solution) × 100
Important Standard Values from the Chapter
- Normal saline solution = 0.9% m/v sodium chloride.
- Common vinegar = 5% v/v acetic acid.
- Glucose solution example = 5% m/v.
- Acetone boiling point ≈ 56°C.
- Water boiling point = 100°C.
- Simple distillation is suitable when the boiling points of two liquids differ by about 25°C or more.
- Fractional distillation is used when the boiling point difference is less than 25°C.