The pKa of:
NH4(+) = 9.4
NH3 = 38
NH2(-) = EXTREMELY HIGH (due to the the instability of compounds like NH(2-) and N(3-) the pKa values are not currently known -- they really aren't around for long enough to get an accurate pka value. There may be experimental values in the literature somewhere, but they are likely not going to be the same from source to source!)
pKa of HCHO2, formic acid, methanoic acid, is 3.80
42
7.21
It is a strong acid
pKa=40
how do you calculate pKa
pKa=2.86
pKa = 15
It is around pKa=13
HCHO2 is methanoic acid and is normally written as HCOOH. When reacted with potassium hydroxide (KOH) , it produces potassium methanoate. and water/ HCOOH +KOH = HCOO^-K+ + H2O
Doxofylline Pka value is about 9.8.
pKa (dissociation constant) is variable with temperature.
The pka of a protonated ether (the conjugate acid) is about -3.5
The pKa of sulfonic acid is < 0
pKa of methanol is 15.5 see this pdf for more information about pka-values: http://chemweb.unp.ac.za/chemistry/Physical_Data/pKa_compilation.pdf