Question

A testtube contains solution of NaOH and Phenolphthalein. Why the colour
of the solution changes when HCl in added to it.


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Answer 1

$\Huge{\textbf{\textsf{\color{orange}{α}{\purple{иѕω}{\pink{єя}{\color{pink}{:}}}}}}}$

• In alkaline solution, phenolphthalein gives pink color as it works as an indicator which shows its endpoint when it reacts with hydroxide ions of the base. It is a commonly used indicator in acid-base titrations. In acidic solution when acid is added, phenolphthalein gives a colorless solution.

Answer 2

$\huge\underline\mathfrak\purple{anѕwєя:}$

• In alkaline solution, phenolphthalein gives pink color as it works as an indicator which shows its endpoint when it reacts with hydroxide ions of the base. It is a commonly used indicator in acid-base titrations. In acidic solution when acid is added, phenolphthalein gives a colorless solution.