Meanings :
1. Acid: The substance that taste sour.
2. Acidic: The chemical nature of acids.
3. Base: The substances which are bitter in taste and feel soapy to touch.
4. Basic: The nature of base.
5. Indicators: Special type of substances used to test whether a substance is acidic or basic.
6. Litmus: The most commonly used natural indicators.
7. Neutral: The solutions which do not change the colour of either red or blue litmus.
8. Neutralisation: The reaction between an acid and a base.
9. Salt: A new substance formed on neutralization.