Acid-Base Chemistry of White Wine: Analytical Characterisation and Chemical Modelling

Table 6

Chemical modelling. Equilibrium-based simulation at 25°C to obtain a calculated value of pH (pH_calc) according to the four chemical models depending upon the ionic strength value and the percentage of ethanol.

Wine	% vol.	pH(exp^a)	pHcalc
			Model 1	Model 2	Model 3	Model 4
			EtOH 0%, KCl 0.05 M	EtOH 0%, KCl 0.1 M	EtOH 12%, KCl 0.05 M	EtOH 12%, KCl 0.1 M
C07	11.7	3.13	2.85	2.85	2.99	2.99
C08	11.8	3.12	2.86	2.86	2.99	2.99
E07	12.3	3.24	2.98	2.98	3.13	3.13
E08	12.3	3.05	2.86	2.86	3.00	3.00
Ch09	13.3	3.21	3.06	3.06	3.19/3.21^(b)	3.20
R07	12.3	3.16	3.07	3.07	3.22	3.22

^(a)pH_exp is the experimental pH measured at 𝑇=25°C and expressed as −log[H⁺].
^(b)pH value corrected for % ethanol.