A test tube contains solution of NaOH and phenophthalein.why the colour of the solution changes when HCL in added to it.
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when the NaOH is added to phenolphthalein the colour would change into pink. But when HCl is added to it, the NaOH would react with HCl forming, NaCl and H2O which are neutral. and we all know that phenolphthalein in neutral solution is colourless....
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