Question

40. What is the pOH of a 0.045 M solution of calcium hydroxide, Ca(OH)2? A) 1.05 B) 12.95 C) 12.65 D) 1.35 41. From Table 16.3, which of the following statements for Carbonic acid is true? See page 7 TABLE 16.3. Acid-Dissociation Constants of Some Common Polyprotic Acids Formula KI Ascorbic HỊCH, 80 X 10+ 16 X 10-12 Carbonic H.CO, 43 X 10 56 x 101 Citric HC,H,Op 74 X 10+ 1.7 X 100 4.0 X 10 Oxalic H.CO 5.9 X 10+ 64 X 10 Phosphoric H,PO 7.5 X 10- 6.2 X 10" 02 X 10-15 Sulfurous H2SO, 1.7 X 100 6.4 X 10" Sulfuric HSO Large 1.2 x 10 Tartark HCM, 10 X 10° 46 X 100 A) Polyprotic acids contain only one ionizable or available proton (H. B) It is easier to remove the second proton (H) than the first proton (H'). Page 7 C) If the difference between K, and subsequent K, values are > 10%, the pH generally depends only on the first dissociation. D) None of the statements are true. 42. The Henderson-Hasselbalch equation is A) [H) - K. + [base] /[acid] B) pH = pk. - log [base] / [acid] C) pH-PK. + log (base] / [acid) D) pH-PK, +log (acid]/[base] E) pH-log (acid] /[base) 43. According to the Arrhenius concept, an acid is a substance that A) is capable of donating one or more Htions. B) increases in the concentration of H' ions in aqueous solutions. C) can accept a pair of electrons to form a coordinate covalent bond. D) reacts with the solvent to form the cation formed by autoionization of that solvent. E) tastes bitter