Question

Phenolphthalein is ___________.

The natural indicator

The synthetic indicator

An olfactory indicator

The universal indicator


please answer the correct
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Answer 1

Answer:

• Phenolphthalein is a chemical compound with the formula C₂₀H₁₄O₄ and is often written as "HIn" or "phph" in shorthand notation. Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
• Formula: C₂₀H₁₄O₄
• Molar mass: 318.32 g/mol
• Melting point: 260 °C
• Boiling point: 557.8 °C
• Appearance: White powder
• UV-vis (λmax): 552 nm (1st); 374 nm (2nd)