Question

Q(13) A diprotic acid has two dissociation constants Kia for the first proton and Kzn for the second proton. Which is the relationship between the two Ka? A) K1a>K2a B) K1a<K2 C) K12=K2a D) K10<< K2a E) It cannot be determined Q(14) A 1.25 M solution of the weak acid HA is 9.2% dissociated. What is the pH of the solution? A) 0.64 B) 0.94 C) 1.13 D) 2.16 E) None of these choices is correct. Q(15) What is the effect on equilibrium when sodium formate is added to a solution of formic acid? A) No change in the equilibrium B) Equilibrium shifts to the right. C) More information is needed to answer the question. D) Equilibrium shifts to the left. Q(16) What is the effect on equilibrium when sodium acetate is added to a solution of acetic acid? CH3COOH(aq) +HH(aq) CH3COO(aq)

Answer 1

13. For any diprotre ov tr prote'c acids 1S+ dissociation ans 3rd the Least constant it alway larger than 2n a) Kia k2a HA Ht A C-Cd g.2 0.092 tסט CH+ C .25 Mxo09 O.11S M PH 0.94 15 HCOOH + HCOO Tineneases Nat t HCOONA HCoo Equilibium will shilt to the eRt (Backusand) to Le-chateries principal whan the preduct Acconding Concautration increases by outer side equilibnum Wilr Shitt touads reactant and vice versa