Bases turn methyl orange-yellow.
When an acid is dissolved in the water, we get an acidic solution. When a base dissolves in water, it is an alkali and makes an alkaline solution. If a solution is neither acidic nor alkaline, it is neutral.
The pH scale is used to measure acidity and alkalinity:
- solutions with a pH less than 7 are acidic
- solutions with a pH of 7 are neutral
- solutions with a pH greater than 7 are alkaline
Methyl orange and Phenolphthalein
- Methyl orange is one of the indicators commonly used in titrations. For example, in an alkaline solution, methyl, orange is yellow.
- Phenolphthalein is another commonly used indicator for titrations and is another weak acid.
- Phenolphthalein is a weak acid that dissociated into ions at a pH range of 8.3 to 10. Methyl orange is a weak base that ionized at a pH range of 3.1 to 4.4
Colour in acidic solution: Colourless
Colour in basic solution: Pink
- Methyl orange:
Colour in acidic solution: Red
Colour in basic solution: Yellow