Table 2.

Na₂HPO₄–NaH₂PO₄ buffer solutions, pH 6.8–8.0 at 25 °C [21]

pH, 25 °C	xml 0.2 M Na2HPO4	yml 0.2 M NaH2PO4
7.0	30.5	19.5
7.2	36.0	14.0
7.4	40.5	9.5
7.6	43.5	6.5
7.8	45.75	4.25
8.0	47.35	2.65

xml 0.2 M Na₂HPO₄, yml 0.2 M NaH₂PO₄; diluted to 100 ml with H₂O → 0.1 M solution

x/2 ml 0.2 M Na₂HPO₄, y/2 ml 0.2 M NaH₂PO₄; diluted to 100 ml with H₂O → 0.05 M solution

xml 0.2 M Na₂HPO₄, yml 0.2 M NaH₂PO₄; diluted to 1,000 ml with H₂O → 0.01 M solution

…