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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Why does phenolphthalein turn pink in sodium carbonate solution?

Answer and explanation

Correct answer: Because the solution is basic

The governing concept is the colour change of an acid-base indicator. Sodium carbonate is a salt of a strong base and a weak acid, so its aqueous solution is alkaline because carbonate ions react partly with water to produce hydroxide ions. Phenolphthalein is pink in a basic medium. Therefore option A correctly explains the observation. It is not caused by strong acidity, universal pink colour, or insolubility; sodium carbonate dissolves in water.

Related tags

PhenolphthaleinSodium CarbonateBasic SaltIndicatorAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour
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10 more MCQs
  1. 1What type of substance turns blue litmus paper red?
  2. 2What type of substance turns red litmus paper blue?
  3. 3Which of the following substances acts as a natural indicator?
  4. 4What is the general nature of an aqueous soap solution?
  5. 5Which of the following substances turns red litmus paper blue?
  6. 6What is the nature of a solution whose pH is less than 7?
  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
  8. 8A student dips red litmus paper into a soap solution. What change will occur in the red litmus paper?
  9. 9Which gas is generally produced when dilute acids react with active metals?
  10. 10A student dips red litmus paper into a soap solution. What will be the colour of the litmus paper?
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