from stock solutions

10X PBS from stock solutions

from Sigma ready-made 1X:

M (1X) M (10X) ingredient
0.01 0.10 Na-K Phosphate
0.138 1.38 NaCl
0.0027 0.027 KCl
calculated from Carrie's dry ingredients recipe:
To make L 10X PBS
add: mL 5M NaCl
add: mL 1M KCl
add: mL 1M KH2PO4
add: mL 1M Na2HPO4.7 H2O (MW = 268.07)

pH to 7.3 with NaOH

sterilize


OR

To match Sigma recipe:

Make 1M Na2HPO4 (base); 1 M KH2PO4 (acid)

Mix to pH 7.3

(should be ~38.25 mL Na2HPO4, 11.5 mL KH2PO4) from the Sigma Buffer Reference Center

pH mL Na Phos dibasic mL Na Phos monobasic
7.2 36.0 14.0
7.4 40.5 9.5

Then

To make L 10X PBS
add: mL 5M NaCl
add: mL 1M KCl
add: mL 1M K-Na Phosphate