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Phenolphthalein's pH sensitivity is exploited in other applications: concrete has naturally high pH due to the calcium hydroxide formed when Portland cement reacts with water. As the concrete reacts with carbon dioxide in the atmosphere, pH decreases to 8.5–9. When a 1% phenolphthalein solution is applied to normal concrete, it turns bright pink.
1,10-Phenanthroline (phen) is a heterocyclic organic compound. It is a white solid that is soluble in organic solvents. It is a white solid that is soluble in organic solvents. The 1,10 refer to the location of the nitrogen atoms that replace CH's in the hydrocarbon called phenanthrene .
134.134 g·mol −1 Melting point: ... Phthalide is an organic chemical compound with the molecular formula C 8 H 6 O 2. ... (such as phenolphthalein), ...
c 6 h 4 (ch 3) 2 + 7 + 1 / 2 o 2 → c 4 h 2 o 3 + 4 h 2 o + 4 co 2 Phthalic anhydride and maleic anhydride are recovered by distillation by a series of switch condensers . The naphthalene route (the Gibbs phthalic anhydride process or the Gibbs–Wohl naphthalene oxidation reaction) has declined relative to the o -xylene route.
PubChem can be accessed for free through a web user interface. Millions of compound structures and descriptive datasets can be freely downloaded via FTP. PubChem contains multiple substance descriptions and small molecules with fewer than 100 atoms and 1,000 bonds. More than 80 database vendors contribute to the growing PubChem database. [2]
For the first time in over a decade, obesity rates in the United States may finally be heading in the right direction and new weight loss drugs like semaglutide could be part of the reason why. A ...
(The Center Square) – A California court cracked down on the California Coastal Commission for its “prejudicial abuse of discretion” when denying homebuilding permits.
January 6, 2025 at 1:29 PM. Jennifer Causey / Food Styling by Emily Nabors Hall / Prop Styling by Christina Daley.