What is the pKa value of water?

15.74
Organic chemistry texts feature pKa = 15.74 for water and −1.74 for H+(aq), whereas the respective values cited in almost all other chemistry texts are 14.00 and 0.00.

Are nitro groups acidic?

Acidic character: Due to the strong electron withdrawing nature of the nitro group (-I effect) the α-hydrogen bonded to the carbon atom bearing the nitro group is acidic, which can easily be abstracted by a base.

Are nitro groups soluble in water?

Nitro compounds are polar, and those with no other chemically reactive grouping are colourless or pale yellow liquids that are only slightly soluble in water.

How is the pH of a nitro group affected?

Due to the -I inductive effect of the s bond the pKa values of nitro group containing compounds can also be affected; Ph-NO 2, this substituent is ortho, para directing due to the -R resonance effect of the p bond.

What is the pKa of 4-nitrophenol?

The pKa of 4-nitrophenol is 7.15 (3), indicating that this compound will partially exist in the ionized form in water and moist soils and the anion will not volatilize (SRC). 4-Nitrophenol is not expected to volatilize from dry soil surfaces (SRC) based upon a vapor pressure of 9.79X10-5 mm Hg at 20 deg C (4).

Why is the nitro group in an aromatic compound acidic?

The nitro group is also strongly electron-withdrawing. Because of this property, C−H bonds alpha (adjacent) to the nitro group can be acidic. For similar reasons, the presence of nitro groups in aromatic compounds retards electrophilic aromatic substitution but facilitates nucleophilic aromatic substitution.

Which is not present in the functional group pKa?

not present P Protonated   carbonyl    pKa   =   ‐7 2. P Protonated   alcohol   or   ether     pK H2   =   35 3 3. C Carboxylic   acid     pKa   =   4‐5 4 4. A Ammonium   ion     pKa   =   9‐10 5 5. P Phenol    pKa   =   10 6