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North Rhine-Westphalia Zentralabitur Chemistry Practice Questions - North Rhine-Westphalia Zentralabitur Chemistry (Chemie) Exam
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Question Number 5
What indicator property makes phenolphthalein useful for detecting the equivalence point of a strong acid-strong base titration?
It changes color (colorless to pink) around pH 8.2-10, near the equivalence point's neutral-to-basic transition
It only changes color at pH 0
It permanently reacts with the acid, consuming it entirely
It has no measurable color change at any pH
✔ Correct Answer:
It changes color (colorless to pink) around pH 8.2-10, near the equivalence point's neutral-to-basic transition
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