a. What is the pH and what is the volume of added acid at the equivalence point?

Question

a. What is the pH and what is the volume of added acid at the equivalence point? b. At what volume of added acid is the pH calculated by working an equilibrium problem based on the initial concentration and K_b of the weak base? c. At what volume of added acid does pH = 14 pK_b? d. At what volume of added acid is the pH calculated by working an equilibrium problem based on the concentration and K_a of the conjugate acid? e. Beyond what volume of added acid is the pH calculated by focusing on the amount of excess strong acid added?

Explanation / Answer

(a) pH at the equivalence point = 6

volume to reach equivalence point = 30mL

------------------------------------

(b) at volume of acid added = 0 mL, pH is calculated by considering Kb and the intial concentration only.

------------------------------

(c) at V= 15mL, pOH= pKb

pH = 14-pKb

----------------------------------------

(d) at V= 30mL when all the base is converted to conjugate acid , calculation is performed using Ka of the comjugate base and its concentration.

--------------------------------

(e) Beyond 30mL pH depends on amount of excess acid added.

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.