In the part of "Recipes" ninth item :
“10 mM acetic acid-sodium acetate buffer (100 ml, pH = 4.6)
0.136 g sodium acetate
Add 90 ml water
Adjust pH to 7.5 with acetic acid
Make up to 100 ml ”
should the "Adjust pH to 7.5 with acetic acid" revised as "Adjust pH to 4.6 with acetic acid" ?