Why is pKa of phenol low?
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.
Why is phenol pKa 10?
Even though phenol is 106 more acidic than water, its pKa of 10 tells you that the acidity constant is 10-10 or that only one part in 1010 is ionized, the rest exists as phenol with H attached to oxygen.
What is the pKa of hclo4?
≈ -8
Examples of Strong Acids Perchloric acid (HClO4): pKa ≈ -8. Hydrochloric acid (HCl): pKa = -6.3.
What is the pKa of a phenyl group?
In the table below, pKa1 and pKa2 for water solutions at 25°C are given together with boiling and melting point, density and molecular weight, as well as number of carbon, hydrogen and oxygen atoms in each molecule….
| IUPAC name | Phenol |
|---|---|
| #C | 6 |
| #H | 6 |
| #O | 1 |
| pKa1 | 9.98 |
Why does phenol have a lower pKa than cyclohexanol?
One of the Important effects on the acidity of a molecule is if the conjugate base anion can be stabilized by resonance. Phenol, for example , is stronger acid than cyclohexanol because the conjugate base of phenol is much more stable than the conjugate base of cyclohexanol.
What are phenols Class 12?
Phenols are the compounds formed when a hydrogen atom in an aromatic ring, is replaced by a hydroxyl group (-OH group).
What is the pKa of CH3CH2OH?
CH3CH2OH (ethanol) pKa = 16, Ka = 10^-16.
What is the pKa of hydroxide?
Sodium hydroxide is the conjugate base of H2O (pKa 15.7).
What is a phenol group?
Phenols are organic compounds which contain a hydroxyl (—OH) group attached to a carbon atom in a benzene ring. Their chemical behavior is very distinct from that of alcohols, because they are not capable of undergoing the same oxidation reactions that alcohols participate it.