Acid and Alkali

Science

The paper strip is used to identify the property of a substance whether it is acidic or alkaline

Litmus paper

Colour of the blue litmus paper if dipped in acidic solution

Change to red

Colour of the blue litmus paper if dipped in alkaline solution

No change

Colour of red litmus paper if dipped in acidic solution

No change

Colour of red litmus paper if dipped in alkaline solution

Change to blue

Colour of blue and red litmus paper if dipped in neutral solution

No change

The characteristic of an acidic substance

Change blue litmus paper to red and have a sour taste

The characteristic of an alkaline substance

Change red litmus paper to blue and have a bitter taste

The characteristic of neutral substances

Will not change the colour of litmus paper and have a sweet, tasteless or salty taste

Natural substances that substitute litmus paper

Turmeric juice, purple cabbage juice and hibiscus extract