pK = 1.64 at 20oC
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Atrazine is a herbicide or weed-killer, that is mainly used on corn. It is the most common chemical contamination in the ground water of the United States.
The pKa of drotaverine is around 8.67.
You can calculate the pKa value by using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid. Rearranging the equation, you can solve for pKa by taking the antilog of both sides after isolating pKa.
The pKa value of azithromycin is around 8.4.
pKa (dissociation constant) is variable with temperature.