Answer:
0.05M is the concentration of the phosphate buffer
Step-by-step explanation:
A buffer is defined as the aqueous mixture of a weak acid (KH₂PO₄) and its conjugate base (K₂HPO₄). The concentration of this buffer is the sum of the concentrations of the weak acid and the conjugate base, that is:
Concentration of phosphate buffer = 0.02M + 0.03M
=
0.05M is the concentration of the phosphate buffer