i'll check w/ the CRC, but according to my protocol book (molecular cloning,
by Tom Maniatis), to make phosphate buffers of different pH, we have to make
1M Na2HPO4 and 1M NaH2PO4 stock and mix them with different amounts to get the desired final pH - for example,
with 25.5 ml 1M Na2HPO4 + 74.5 ml 1M NaH2PO4 into a final 1 L, u get a
0.1 M sodium phosphate buffer of pH 6.4
whereas if u use 93.2 ml 1M Na2HPO4 + 6.8 ml 1M NaH2PO4 into a final 1 L,
u get a 0.1 M sodium phosphate buffer of pH 8.0
so from this, i assume we CAN make a 1M Na2HPO4 stock solution.