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An substance X solution in water turns red litmus blue. What will be the change in color of phenolphthalein when it is added to the solution of X ?
1. No change
2. It turns pink
3. It turns blue
4. It turns reddish

1 Answer

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Correct Answer - Option 2 : It turns pink

Concept:

  • Indicators are the substances that are used to identify whether the given substance is an acid or a base.
  • The indicators change their colour when added to a solution containing an acidic or a basic substance.
  • Turmeric, litmus, china rose petals, etc., are some of the naturally occurring indicators.
  • The most commonly used natural indicator is litmus.
  • It is extracted from lichens.
  • It is available in the form of a solution, or in the form of strips of paper, known as litmus paper.
  • Generally, it is available as red and blue litmus paper.
  • Man-made: Phenolphthalein, Methyl orange are some of the man-made indicators.


Explanation:

  • Some indicators and their colour change are given in the table below:

 

Indicator Colour Change in Acidic Solution Colour Change in Basic Solution
Phenolphthalein Colourless Pink
Methyl Orange Red or Orange Yellow
Litmus Paper Red Blue
Turmeric Yellow Red
China Rose Dark pink Green

 

  • The solution 'X' changes red litmus to blue. This infers that the substance is making a basic solution in water.
  • As the solution is basic, it will change the colour of phenolphthalein into blue. 
  • Hence, the 'solution turns pink' is the correct option.

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