. 2019 Nov 29;9(12):161. doi: 10.3390/membranes9120161

Table 1.

pH in different solution used.

Dilute Acids	pH (Pitzer eq) [75,76,77,78]
1. 50 mM HCl	1.38
2. 10 mM HCl	2.05
3. 1 mM HCl	3.02
4. 0.1 mM HCl	4.01
5. 0.1 mM HCl + 0.1 M KCl	4.03
6. 0.1 mM HCl + 1 M KCl	4.09
Buffers & Dilute Buffers	-
7. Orion PureWater buffer A	6.97
8. Orion PureWater buffer B	4.10
9. 50 mM potassium hydrogen phthalate	4.01
10. 10 mM potassium hydrogen phthalate	4.12
11. 100 mM HOAc/100 mM NaOAc	4.65
12. 10 mM HOAc/10 mM NaOAc	4.71
13. 25 mM KH₂PO₄/25 mM Na₂HPO₄	6.88
14. 2.5 mM KH₂PO₄/2.5 mM Na₂HPO₄	7.06
15. 10 mM disodium tetraborate	9.18 [79,80] ^☨
16. 5 mM disodium tetraborate	9.20 [13], 9.21 [5], 9.19 [79]

^☨ PHREEQCI’s database did not contain the relevant information for boric acid/borate, so values were found in the literature.