Class 7 Chapter 5 Acids, Bases and Salts

Introduction

• As we know that curd, lemon juice, orange juice and vinegar taste sour. These substances taste sour because they contain acids.
• These substances are acidic in nature. The word acid comes from the Latin word acere which means sour.
• Substances which are bitter in taste and soapy to touch are called bases.
• These substances are basic in nature. For example, baking soda, soap, lime water etc.