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Phenolphthalein (/ f ɛ ˈ n ɒ l (f) θ ə l iː n / [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 often used as an indicator in acid–base titrations.
This is a list of prices of chemical elements.Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison.
A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions. A universal indicator can be in paper form or present in a form of a solution. [1]
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The price of a new drug (in most cases) is limited so that the cost of therapy with the new drug is in the range of the costs of therapy with existing drugs in the same therapeutic class. The price of a breakthrough drug is limited to the median of its prices in France, Germany, Italy, Sweden, Switzerland, Britain, and the United States.
If you’re stuck on today’s Wordle answer, we’re here to help—but beware of spoilers for Wordle 1304 ahead. Let's start with a few hints.
Upon reduction, the very intense pink color of the cationic form of phenolphthalein fades to a faint yellow color. It is this form of phenolphthalein that is present in Kastle–Meyer test kits. In order to generate the intense pink color indicative of a positive test, the reduced phenolphthalein must be oxidized back to its normal, colored form.
Ben Cost January 8, 2025 at 10:14 AM Airbnb guest Ana Mostarac claimed that the company refused to refund her after she attempted to cancel her reservation due to the ongoing Los Angeles wildfires.