What is indicated by the shape of the litration curve? A) A dtprotic acid was ti

Question

What is indicated by the shape of the litration curve? A) A dtprotic acid was titrated with a strong base. B) A triprotic acid was titrated with a strong base. C) A diprotic base was titrated with a strong acid. D) A triprotic base was titrated with a strong acid. E) A strong acid was titrated with a strong base. 8. The degree of ionization of a strong base is A) 100%. B) between 1 and 10%. C) between 10 and 100%. D) dependent on the concentration of the acid. E) dependent the value ot Ka. 9. The pH of a NaOH 0.01 M is: A) 2 B) 12 C) 0.01 D) 1 E) 10 10. Which statement about sulfurous acid and sulfuric acid is correct? A) They are both weak acids. B) They are both strong acids. C) They both have two ionizable protons. D) Sulfuric acid has the formula H_2SO_3. E) Sulfurous acid has the formula H_2SO_4. 11. Which is the pKa of acrylic acid is its Ka is 5.5 times 10^-5 A) 4.26 B) 5.5 C)5 D)-4.5 E) -5 12. Determine the K_b expression for NaNO_2 if HNO_2 H^+ + NO_2^- has an acid dissociation constant = K_a A) K_b = 1/K_a B) K_b = pK_a C) K_b = K_aK_a D) K_b = K_a-K_a E) K_b = K_w/K_a 13. Determine the pOH of a solution which pH is 11.23 A) 5.89 times 10^-12 B) 2.77 C) 0.089 D) 4.5 E) 6.9 14. As the pH decreases, the solubility of would increase. A) MgF_2 B) NaNO_3 C) FeCI_2 D) Cu(NO_3)_2 E) LiOH 15. In the Brenstcd-Lowry definition of acids and bases, an acid A) is a proton acceptor. B) is a proton donor. C) breaks stable hydrogen bonds. D) corrodes metals. E) forms stable hydrogen bonds. 16. Which sketch best represents the qualitative molecular view of an aqueous solution of perchloric acid (strong acid)? (Water molcculcs arc not shown explicitly, dark balls arc H^+.)

Explanation / Answer

(7) C

(8) 100 % strong acid undergoes complete ionisation

(9) [OH-] = 0.01 = 10 -2 M

pH = 14 + Log [OH-]

pH = 14 + Log (10 -2) = 12

(10) C they both have two ionisable protons

(11) pKa = - Log Ka = - Log(5.5 x 10 -5) = 4.26

(12) Kb = Kw / Ka

(13) pOH = 14 - pH = 14 - 11.23 = 2.77

(14) LiOH would increase

(15) An acid is a proton donor

(16) B

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