An Exact Method to Determine the Conductivity of Aqueous Solutions in Acid-Base Titrations

Table 1

Comparison of the p and the limiting equivalent conductivities values from different sources, at = 25°C and zero ionic strength, with the p and the equivalent conductivities values used to construct the plots in Figures 1–7 with a robust model to perform the estimation.

Species	p at zero ionic strength^b	p used for the fitting (Figure 1)	p used for the fitting (Figures 2 and 3)	p used for the fitting (Figures 4 and 5)	p used for the fitting (Figures 6 and 7)
H2O^a	14.00	13.8	13.8	13.7	13.8
	1.98	1.75	1.6
CH3COOH	4.757			4.6	4.7
H3BO3	9.24			9.1	9.2
H3PO4	2.149				2.1
	7.207				7.1
	12.346				12.3
Ion	/mS·eq^−1·cm^2	/mS·eq^−1·cm^2   Figure 1	/mS·eq^−1·cm^2  Figures 2 and 3	/mS·eq^−1·cm^2  Figures 4 and 5	/mS·eq^−1·cm^2  Figures 6 and 7
H^+	349.6^c; 350.0^d; 350.1^e	350.1	350.1	350.1	350.1
OH^−	198.0^c; 199.2^e	195.0	190.0	190.0	199.0
Na^+	50.11^c,e	50.11	50.0	49.0	50.0
	50.0^e	50.0	49.0
	79.8^c; 80.0^e	86.0	60.0
CH3COO^−	40.9^c; 41.0^e			41.0	38.0
	—			22.0	20.0
	36.9^e				10.0
	57.0^e				29.0
	69.0^e				45.0

^aThe value of p is reported in this line.
^bPuigdomenech [20].
^cBard and Faulkner [2].
^dPingarrón [3].
^eDean [4].