A - the sodium salt of a weak acid with pKa = 7.12, Mr = 120.0
B - the disodium salt of the conjugate base of A, Mr = 142.0
C - a synthetic amine (NH2 form), Mr = 121.4. The pKa of the
protonated amine (NH3+) is 8.3.
Using any one or combination of the unknowns above, as well as other required solutions available in the laboratory, prepare 100mL of 0.1M buffer pH 7.6.