Indicators
An indicator A chemical that gives a colour change in acidic, alkaline and neutral solutions. is a chemical that changes colour in acidCorrosive substance which has a pH lower than 7. , alkaline When a base dissolves in water it is an alkali and makes an alkaline solution. and neutralIf a solution is neither acidic nor alkaline it is neutral. solutions. Some common indicators include red litmus paper, blue litmus paper, phenolphthalein, and methyl orange.
Indicator | Acidic | Neutral | Alkaline |
Red litmus paper | red | red | blue |
Blue litmus paper | red | blue | blue |
Indicator | Red litmus paper |
---|---|
Acidic | red |
Neutral | red |
Alkaline | blue |
Indicator | Blue litmus paper |
---|---|
Acidic | red |
Neutral | blue |
Alkaline | blue |