Question

How to prepare 0.02 m sodium phosphate buffer?

Answer 1

Prepare 0.02M Na2HPO4 (di-basic) and 0.02M NaH2PO4 (mono-basic) separately, make up the volume for both. Check the pH for both separately. Add the one that has lower pH to the one that has a higher pH until the pH reaches 6.9. Add 0.006M Nacl