Sodium Phosphate

To make 100 mL 1M sodium phosphate at a given pH:

pH 1 M Na2HPO4 1 M NaH2PO4
8.0 93.2 ml 6.8 ml
7.8 89.6 ml 10.4 ml
7.6 84.5 ml 15.5 ml
7.4 77.4 ml 22.6 ml
7.2 68.4 ml 31.6 ml
7.0 57.7 ml 42.3 ml
6.8 46.3 ml 53.7 ml
6.6 35.2 ml 64.8 ml
6.4 25.5 ml 74.5 ml
6.2 17.8 ml 82.2 ml
6.0 12.0 ml 88.0 ml
5.8 7.9 ml 92.1 ml

Dilute to the desired concentration.