A good measure of anion stability is the pKa of an anion's conjugate acid, and leaving group ability indeed generally follows this trend, with lower pK a H's being associated with better leaving group ability.
42.
PKa values for the conjugate acids of several NHC families have been examined in aqueous solution . pKa values of triazolium ions lie in the range 16.5-17.8, around 3 pKa units more acidic than related imidazolium ions.
43.
It works like all other pH indicators-that is, it's a compound where the conjugate acid and the conjugate base have different colors ( so it changes color around the pKa when the molecule gains or loses a proton ).
44.
Weak bases are better leaving groups than strong bases; a species with a strong conjugate acid ( e . g . hydrochloric acid ) will be a better leaving group than a species with a weak conjugate acid ( e . g . acetic acid ).
45.
Weak bases are better leaving groups than strong bases; a species with a strong conjugate acid ( e . g . hydrochloric acid ) will be a better leaving group than a species with a weak conjugate acid ( e . g . acetic acid ).
46.
Perhaps the best known phosphazene bases are BEMP with an acetonitrile pKa of the conjugate acid of 27.6 and the phosphorimidic triamide t-Bu-P4 ( pK BH + = 42.7 ) also known as Schwesinger base after one of its inventors.
47.
Here, one molecule of water acts as an acid, donating an H + and forming the conjugate base, OH ", and a second molecule of water acts as a base, accepting the H + ion and forming the conjugate acid, H 3 O +.
48.
Unlike the previous definitions, the Br�nsted Lowry definition does not refer to the formation of salt and solvent, but instead to the formation of " conjugate acids " and " conjugate bases ", produced by the transfer of a proton from the acid to the base.
49.
In this process acts as a p " K " a of its conjugate acid, hydrogen superoxide ( HO 2 ? also known as " hydroperoxyl " or " perhydroxy radical " ), is 4.88 so that at neutral pH 7 all but 0.3 % of superoxide is in the anionic form,.
50.
Would this be a correct definition of a conjugate acid / base pair : Conjuage acid / bas pair is the acid and base that is formed from the acid after the romoval of one proton . eg H 3 PO 4 / H 2 PO 4 where the H 3 PO 4 is the acid conjugate pair, and the H 2 PO 4 is the bas conjugate pair.
