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Class 10ScienceChemical Substances – Nature and BehaviourAcids, Bases, and SaltsMedium
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Phenolphthalein turns pink in sodium hydroxide. When hydrochloric acid is added slowly, when will the colour disappear?

Answer and explanation

Correct answer: When the solution becomes acidic or nearly neutral

Phenolphthalein is pink only in a sufficiently basic solution. Adding hydrochloric acid supplies hydrogen ions, which neutralise hydroxide ions from sodium hydroxide: HCl + NaOH → NaCl + H2O. As the excess alkalinity is removed and the solution approaches neutral or becomes acidic, phenolphthalein loses its pink colour. The other choices do not describe the indicator transition.

Related tags

PhenolphthaleinNeutralisationIndicatorAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience
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  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?
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  7. 7At 25°C, a solution with a pH greater than 7 is of which nature?
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