WebHợp chất hữu cơ X (chứa C, H, O) chỉ có một loại nhóm chức. Cho 0,15 mol X phản ứng vừa đủ với 180 gam dung dịch NaOH, thu được dung dịch Y. Làm bay hơi Y, chỉ thu được 164,7 gam hơi nước và 44,4 gam hỗn hợp chất rắn khan Z. Đốt cháy hoàn toàn Z, thu được 23,85 gam Na2CO3; 56,1 gam CO2 và 14,85 gam H2O. http://alpha.chem.umb.edu/chemistry/ch313/Exp%207%20phenol.pdf

Why the adding of Folin-Ciocalteu reagent is before the adding of ...

WebExtraction of Carboxylic Acid. A pre-weighed (0.315g) mixture of Carboxylic acid, a phenol, and neutral substance was placed into a reaction tube (tube 1). tert-Butyl methyl ether (2ml) was added to the tube and the solid mixture was dissolved. Next, 1 ml of saturated NaHCO3 solution was added to the tube and the contents were mixed separating ... WebPhenol is acidic enough to do the first step, and so converts carbonate ions into hydrogencarbonate ions, but isn't acidic enough to do the second step. So sodium … synonyms for self sacrifice

Why is methyl orange used instead of phenolphthalein?

WebSep 20, 2024 · I think the main confusion you're having here is that you misinterpretted the composition of the system at the first end point. While you are correct that an equivalent non-equilibrium system is just all $\ce{HCO3-}$, it is not correct to think of this as an acid.This is bicarbonate. Webhave reacted with the phenol and the amount of phenol present at the start was {0.30 mmol Br2 x(1 mmol phenol/3 mmol Br2) =} 0.10 mmol phenol. Because 1 mmol of phenol weighs 94.11 mg. the sample flask contained 9.4 mg of phenol at the start. The present method is an analysis by difference, also called a "back titration". A certain WebThe phenolic content in the extracts was determined by the Folin-Ciocalteu reagent using Gallic acid as the reference compound: 125 μl of the prepared extract was mixed with 500 μl of distilled... synonyms for services provided