Question

What is the ratio of the molarities of PO3^4- and HPO4^2− ions in a buffer solution having a pH of 13.16?
What mass of K3PO4 must be added to 1 L
of 0.1 M K2HPO4(aq) to prepare a buffer
solution with a pH of 13.16?
Answer in units of g
What mass of K2HPO4 must be added to
1 L of 0.1 M K3PO4(aq) to prepare a buffer solution with a pH of 13.16?
Answer in units of g
What volume of 0.15 M K3PO4(aq) must be
added to 50 mL of 0.1 M K2HPO4(aq) to
prepare a buffer solution with a pH of 13.16?
Answer in units of mL

Answer 1

a. Use the Henderson-Hasselbalch equation.