Question

The relevant pKa is about 7.2 at room temperature. SHOWING ALL WORK, calculate the moles of HPO4^2- and H2PO4^- needed to prepare:

a. 240 mL of 0.1 M pH 6 buffer

b. 400 mL of 0.1 M pH 7.2 buffer

c. 200 mL of 0.1 M pH 7 buffer

d. 240 mL of 0.05 M pH 5.8 buffer

HINTS: Buffer (a) is prepared with 28.5% CB & 71.5% CA. Note that for buffer (b), pH = pKa!

Answer 1

a. 240me 2 53 7eot -y г-- o-o398 x o.osr의, 4:59 x10 0398