New 55% Off on All Courses - Enroll Now! Click Here

    Question

    Which of the following indicator produces a pink colour

    in an alkaline solution?
    A Turmeric paper Correct Answer Incorrect Answer
    B Methyl Orange Correct Answer Incorrect Answer
    C litmus paper Correct Answer Incorrect Answer
    D Phenolphthalein Correct Answer Incorrect Answer

    Solution

    Phenolphthalein turns pink when exposed to substances above a pH of 8.2. This colour change is a result of ionization, which alters the shape and charge of phenolphthalein molecules. This causes it to block the blue light spectrum when exposed to alkaline substances, producing a pink to purple hue.

    Practice Next

    Relevant for Exams: