How to prepare a 0,2 M phosphate buffer (Na2HPO4-NaH2PO4), pH 6.4?

I'd like to prepare 0.2M solutions of Na2HPO4 and NaH2PO4 and mix the two solutions (I calculated the correct volume of each solution with the Henderson-Hasselback equation) to obtain the right...

20 May 2013 8,810 38 View