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What is the pKa of a hydroxyl group?

The hydroxyl group of citric and malic acids were found to have similar acidities [pKa = 14.4(±0.3) and pKa = 14.5(±0.1), respectively], with that of lactic acid being less acidic [pKa = 15.1(±1.5)]. The estimated pKa values are lower than the values reported for simple aliphatic alcohols such as methanol and ethanol.

What is the correct order of pKa?


Which compound has highest pKa?

The phenol and ethanol both are alcohols. Out of these phenols are more acidic than phenols. So, they will be least acidic and thus will have the highest pKa value.

What is the pKa of phenol why is its pKa value lower than that of an alcohol?

While in ethanol, ethyl group has a + I effect and increases the electron density around H of O—H group making it difficult to remove H as H+. Hence, phenol is more acidic than ethanol and has lower pKa value than ethanol.

What is the correct order of increasing pKa for the following compounds?


What is the order of pK?

The correct order of pKb is IV > II > I > III. This is because substituent with strong +R effect, +I effect and weaker -I effect increases the basicity. Hence pKb decreases. Also, alkylamines are stronger bases than arylamines.

What is pKa and pH?

The pH is a measure of the concentration of hydrogen ions in an aqueous solution. Essentially, pKa tells you what the pH needs to be in order for a chemical species to donate or accept a proton. The relationship between pH and pKa is described by the Henderson-Hasselbalch equation.

What is the pKa value of phenazine?

pKa Values INDEX Inorganic 2 Phenazine 24 Phosphates 3 Pyridine 25 Carboxylic acids 4, 8 Pyrazine 26 HCO3 10.33* HSe– 11.00* 77 H2CrO4 -0.98 30 H 2S 7.00* 77

Which is the correct pKa for hydroxylamine?

The pKa for hydroxylamine is 5.94(1), which indicates this compound will partially exist in the protonated form(SRC). Volatilization from moist soils and water surfaces is not expected since cations don’t volatilize and the estimated Henry’s Law constant for the neutral species is 6.9X10-9 atm-cu m/mole(SRC),…

What is the formula for an alkanol phenol?

Alkanol: An alcohol where the hydroxyl group is bound to an alkyl group, with the general formula CnH2n+1OH. Phenol: An alcohol where the hydroxyl group is bound to a phenyl group, with the formula C6H5OH. Phenols: A group of compounds consisting of a phenol molecule with one or more substiuents.

What is the formula for a phenyl alcohol?

Phenyl: An phenyl group is a benzene substituent missing one hydrogen, with general formula C6H5. Alcohol: An organic compound in which the hydroxyl functional group (–OH) is bound to a saturated carbon atom.