pH values of (x ml 0.1 M Na2CO3 + y ml 0.1 M NaHCO3) buffer mixtures, with a pH range 9.2 to 9.8.
| pH | 20 °C | 9.2 | 9.4 | 9.5 | 9.8 |
| 37 °C | 8.8 | 9.1 | 9.4 | 9.5 | |
| x ml 0.1 M Na2CO3 | 10 | 20 | 30 | 40 | |
| y ml 0.1 M Na2HCO3 | 90 | 80 | 70 | 60 | |
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