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. 2016 Dec 8;9:121–127. doi: 10.1016/j.bbrep.2016.11.017

Fig. 3.

Fig. 3.

The experimental (•) and model fitted (—) pH profile of universal buffer prepared by titrating Na3PO4 (0.1 M) against a mixture of citric acid (0.05 M) and boric acid (0.2 M). The optimized pKa values for phosphoric acid were 3.259, 7.029, 12.233, citric acid were 2.628, 4.431, 5.620 and boric acid were 9.770, 12.507, 12.920.