Acids, Bases and Salts Class 7 Notes

Acids, Bases and Salts Class 7 Science Notes – Chapter 5

Substances that taste sour in water solutions are called acids. For example, mineral acids, phosphoric acids, etc. Some properties of acids are as follows –

• They change the color of a few indicators. The blue litmus paper turns red
• They liberate hydrogen on reacting with some metals such as iron
• They form salts on reacting with bases
• Acid catalysis – they encourage definite chemical reactions. Please refer Acids, Bases and Salts Class 7 Notes for more revision notes.