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.