Phenolphthalein (/ fɛˈnɒl (f) θəliːn / [citation needed] feh-NOL (F)-thə-leen) is a chemical compound with the formula C 20 H 14 O 4 and is often written as " HIn ", " HPh ", " phph " or simply " Ph " in shorthand notation. Phenolphthalein is …

2022年1月19日 · Phenolphthalein pH Range and Colors. The two main colors of phenolphthalein are colorless and fuchsia, which is a pink-purple-red color, depending on the indicator concentration. Phenolphthalein is colorless under acidic, neutral, and slightly basic conditions.

2023年7月18日 · A typical indicator for acid-base titrations is phenolphthalein, HC 20 H 13 O 4. Phenolphthalein, whose structure is shown below, is a colorless weak acid (K a = 3 × 10 –10 mol/L). Its conjugate base, C 20 H 13 O 4 – has a strong pinkish-red color.

pH Range: Phenolphthalein transitions from colorless at pH ≤ 8.2 to pink at pH ≥ 10. Usage: It is primarily employed in titrations involving strong bases, such as sodium hydroxide (NaOH), where the clear color transition effectively signals the endpoint of the reaction.

2020年9月10日 · If you use phenolphthalein, you expect a pink/red color to vanish below a pH value of 8.0. You titrate until the solution becomes colorless because that is as close to the equivalence point as you can get.

Phenolphthalein can cause cancer according to The Food and Drug Administration (FDA) and The National Toxicology Program. Phenolphthalein appears as white or yellowish-white to pale orange fine crystalline powder. Odorless. Aqueous solution is acidic. Colorless to pH 8.5; pink to deep-red above pH 9.

2025年1月24日 · Phenolphthalein, (C20H14O4), an organic compound of the phthalein family that is widely employed as an acid-base indicator. As an indicator of a solution’s pH, phenolphthalein is colourless below pH 8.5 and attains a pink to deep red hue above pH 9.0.

2023年2月10日 · The pH Range . A pH of 7 is considered neutral on the pH scale, which ranges from 0 to 14. A substance is said to be acidic if its pH is less than 7, and basic if its pH is greater than 7. In alkaline solutions, HPh, which is inherently colorless, turns pink.

2024年2月6日 · What is pH Range of Phenolphthalein? Phenolphthalein has a pH range of approximately 8.2 to 10.0, making it suitable for indicating the endpoint of titrations involving strong bases and weak acids. What is Colour of Phenolphthalein?

Phenolphthalein Powder (ACS Grade) is a high-purity chemical compound certified to meet American Chemical Society (ACS) standards, ensuring the highest quality for analytical and laboratory applications. Renowned for its sharp color change, it is widely used as a pH indicator in acid-base titrations and other analytical processes.