Question

6. How many grams of solid NaH PO, and Na, HPO are required to prepare Idm
of 0.1 M phosphate buffer of pH=7.1. pKa, is 6.8 for buffer. Atomic weight
Na=23, P-31, O=16.​

Answer 1

Answer:

Follow same steps but change molarity from 0.05 to 0.02, then change pH from 7.4 to 2.0 and use pKa1= 2.3 rather than pKa2 = 7.21. Also, as pKa is changing, you will need to change the salts too - from diprotic (H2PO4-) and monoprotic (HPO4--) potassium/sodium salts, to potassium/sodium phosphate (Na3PO4/K3PO4) and monoprotic (HPO4--) potassium/sodium salt.