Question

please show all work neatly

5. (2 pts) Consider the following acids and their dissociation constants HPO4-2(aq) + H2O.. H3O"(aq) + PO4-3(aq) Ka-2.2x 10.13 HCOOH(aq) H20 H3O (a) HCOO (aq) Ka = 1.8x10-4 a. Which is the weaker acid, HPO42 or HCOOH? b. What is the conjugate base of, HPO42 or c. Which acid has the weaker conjugate base? d. Which acid produces more ions? 6. (2 pts) Write a balanced equation for the neutralization of H3PO4(aq) and NaOH(aq) (3 pts) Acetic acid has a Ka of 1.8 x 103. What is the pH of a buffer solution containing 0.15 M CH COOH acetic acid and 0.15 M CH;COO? (Partial credit for correct [H+] from Ka.) 7. Includes 2 points built in extra credit.

Answer 1

5.(a) HCOOH is a weak acid.

(B) Conjugate base of HPO4 2- is PO4 3- and of HCOOH is HCOO-.

(C) Strong acids have weak conjugate base.so, HPO4 2- have a weak conjugate base.

(D) HPO4 2- will produce more ions beacause it is strong acid than HCOOH.

.6. H₃PO₄(aq) + 3 NaOH(aq) = Na₃PO₄(aq) + 3H₂O(l)