General Analytical Procedure for Determination of Acidity Parameters of Weak Acids and Bases

Table 3

The experimental p data obtained for the mixture of PhA, Py4CA, and MA at various compositions of titrand D.

Composition of D	p	p	p	p
PhA + Py4CA + MA; (1 : 1 : 1)	pK1	2.97 ± 0.07	—	3.30 ± 0.03
	pK2	5.31 ± 0.04	4.69 ± 0.03	—
PhA + Py4CA + MA; (1 : 2 : 2)	pK1	2.81 ± 0.06	—	3.12 ± 0.03
	pK2	5.45 ± 0.03	4.71 ± 0.01	—
PhA + Py4CA + MA; (1 : 2 : 1)	pK1	2.78 ± 0.04	4.76 ± 0.02	3.4^*
	pK2	5.53 ± 0.04

 ^*p value const. taken from the literature [see Table 11].