When do bases change the colour of methyl orange?

Bases turn methyl orange-yellow.

Acid-base indicators

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
  • Phenolphthalein:

    Colour in acidic solution: Colourless

    Colour in basic solution: Pink

  • Methyl orange:

    Colour in acidic solution: Red

    Colour in basic solution: Yellow

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