AP Study Questions
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1 ID: A AP Study Questions Multiple Choice Identify the choice that best completes the statement or answers the question. 1 What is the ph of an aqueous solution at 25.0 C in which [H + ] is M? A 3.40 B 2.60 C D E What is the ph of an aqueous solution at 25.0 C in which [OH - ] is M? A B C D E What is the ph of an aqueous solution at 25.0 C that contains M hydronium ion? A B C D E What is the ph of an aqueous solution at 25.0 C that contains M hydroxide ion? A 8.40 B 5.60 C 9.00 D 3.98 E What is the concentration (in M) of hydronium ions in a solution at 25.0 C with ph = 4.282? A 4.28 B 9.71 C D E What is the concentration (in M) of hydroxide ions in a solution at 25.0 C with ph = 4.282? A 4.28 B 9.72 C D E Calculate the poh of a solution at 25.0 C that contains M hydronium ions. A 1.94 B 4.29 C 7.00 D 14.0 E Calculate the concentration (in M) of hydronium ions in a solution at 25.0 C with a poh of A B C D E Which solution below has the highest concentration of hydroxide ions? A ph = 3.21 B ph = 12.6 C ph = 7.93 D ph = 9.82 E ph = Which one of the following statements regarding K w is false? A pk w is at 25 C B The value of K w is always C K w changes with temperature. D The value of K w shows that water is a weak acid. E K w is known as the ion product of water. 11 An aqueous solution at 25.0 C contains [H + ] = M. What is the ph of the solution? A 1.00 B C 13.0 D E The ph of an aqueous solution at 25.0 C is What is the molarity of H + in this solution? A B C 3.3 D E Calculate the molarity of hydroxide ion in an aqueous solution that has a poh of A B 8.67 C D E What is the ph of a M aqueous solution of barium hydroxide? A B C 1.82 D E What is the poh of a M solution of barium hydroxide? A 12.2 B 12.5 C 1.52 D 1.82 E
2 Class Copy - Do Not Write On This Test!!! ID: A 16 An aqueous solution contains M NaOH at 25.0 C. The ph of the solution is. A B 1.00 C D 7.00 E The hydride ion, H -, is a stronger base than the hydroxide ion, OH -. The product(s) of the reaction of hydride ion with water is/ are. A H 3 O + (aq) B OH - (aq) + H 2 (g) C OH - (aq) + 2H + (aq) D no reaction occurs E H 2 O 2 (aq) 18 An aqueous solution contains 0.10 M NaOH. The solution is. A very dilute B highly colored C basic D neutral E acidic 19 Nitric acid is a strong acid. This means that. A aqueous solutions of HNO 3 contain equal concentrations of H + (aq) and OH - (aq) B HNO 3 does not dissociate at all when it is dissolved in water C HNO 3 dissociates completely to H + (aq) and NO 3- (aq) when it dissolves in water D HNO 3 produces a gaseous product when it is neutralized E HNO 3 cannot be neutralized by a weak base 20 A M aqueous solution of Ca(OH) 2 at 25.0 C has a ph of. A B 1.85 C D E HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving mol of HZ in sufficient water to yield 1.0 L of solution. The ph of the solution was 4.93 at 25.0 C. The K a of HZ is. A B C D E The ph of a 0.55 M aqueous solution of hypobromous acid, HBrO, at 25.0 C is What is the value of K a for HBrO? A B C D E A 0.15 M aqueous solution of the weak acid HA at 25.0 C has a ph of The value of K a for HA is. A B C D E The K a of hypochlorous acid (HClO) is at 25.0 C. Calculate the ph of a M hypochlorous acid solution. A 1.41 B 8.94 C 4.47 D 7.52 E The K a of hypochlorous acid (HClO) is What is the ph at 25.0 C of an aqueous solution that is M in HClO? A B C D E The K a of hydrofluoric acid (HF) at 25.0 C is What is the ph of a 0.35 M aqueous solution of HF? A 3.25 B 1.81 C 3.64 D 0.46 E The K a of hydrazoic acid (HN 3 ) is at 25.0 C. What is the ph of a 0.35 M aqueous solution of HN 3? A 1.14 B 2.41 C 5.23 D 2.59 E The acid-dissociation constants of sulfurous acid (H 2 SO 3 ) are K a1 = and K a2 = at 25.0 C. Calculate the ph of a M aqueous solution of sulfurous acid. A 4.53 B 1.30 C 1.86 D 6.21 E The acid-dissociation constants of phosphoric acid (H 3 PO 4 ) are K a1 = , K a2 = and K a3 = at 25.0 C. What is the ph of a 2.5 M aqueous solution of phosphoric acid? A 1.82 B 0.40 C 2.51 D 0.88 E Of the following acids, is not a strong acid. A HNO 2 B H 2 SO 4 C HNO 3 D HClO 4 E HCl 31 Of the following, is a weak acid. A HF B HCl C HBr D HNO 3 E HClO 4 2
3 Class Copy - Do Not Write On This Test!!! ID: A 32 Which one of the following is the weakest acid? A HF (K a = ) B HClO (K a = ) C HNO 2 (K a = ) D HCN (K a = ) E Acetic acid (K a = ) 33 Of the acids in the table below, is the strongest acid. 34 The K a of hypochlorous acid (HClO) is at 25.0 C. What is the % ionization of hypochlorous acid in a M aqueous solution of HClO at 25.0 C? A B 14 C D 0.14 E Which one of the following is a Br nsted-lowry acid? A (CH 3 ) 3 NH + B CH 3 COOH C HF D HNO 2 E all of the above A HOAc B HCHO 2 E HOAc and HCHO 2 C HClO D HF 36 In which of the following aqueous solutions does the weak acid exhibit the highest percentage ionization? A 0.01 M HC 2 H 3 O 2 (K a = ) B 0.01 M HNO 2 (K a = ) C 0.01 M HF (K a = ) D 0.01 M HClO (K a = ) E These will all exhibit the same percentage ionization. 37 Classify the following compounds as weak acids (W) or strong acids (S): benzoic acid nitric acid acetic acid A W W W B S S S C S W W D W S S 38 Classify the following compounds as weak acids (W) or strong acids (S): hydrocyanic acid hydrofluroic acid phenol A W W W B S S S C S W W D W S S 39 Classify the following compounds as weak acids (W) or strong acids (S): nitrous acid hydrochloric acid hydrofluoric acid A W W W B S S S C S W W D W S S 40 Classify the following compounds as weak acids (W) or strong acids (S): hypochlorous acid perchloric acid chloric acid A W S S B S S S C S W W D W W W 3
4 Class Copy - Do Not Write On This Test!!! ID: A 41 The acid-dissociation constant at 25.0 C for hypochlorous acid (HClO) is At equilibrium, the molarity of H 3 O + in a M solution of HClO is. A B C D 4.76 E The ph of a 0.10 M solution of a weak base is What is the K b for this base? A B C D E Calculate the ph of a M aqueous solution of NH 3. The K b of NH 3 is A 8.95 B C 2.52 D 5.05 E Determine the ph of a 0.35 M aqueous solution of CH 3 NH 2 (methylamine). The K b of methylamine is A B 3.86 C D 1.96 E An aqueous solution contains M of methylamine. The concentration of hydroxide ion in this solution is M. K b for methylamine is A B C D E Ammonia is a. A weak acid B strong base C weak base D strong acid E salt 47 Classify the following compounds as weak bases (W) or strong bases (S): ammonia flouride ion sodium hydroxide A W W S B S S S C S W W D W S S 48 Classify the following compounds as weak bases (W) or strong bases (S): methylamine carbonate ion potassium hydroxide A W W S B S S S C S W W D W S S 49 The base-dissociation constant of ethylamine (C 2 H 5 NH 2 ) is at 25.0 C. The [H + ] in a M solution of ethylamine is M. A B C D E Completion Complete each statement. 50 A solution of acetic acid is 2.0% dissociated at 25.0 C. What was the original concentration (in M) of the acetic acid solution? The K a at 25.0 C for acetic acid is A solution of ammonia is 2.0% ionized at 25.0 C. What was the original concentration (in M) of the ammonia solution? The K b at 25.0 C for ammonia is A solution of formic acid is 3.0% dissociated at 25.0 C. What is the original concentration (in M) of the formic acid solution? The K a at 25.0 C for formic acid is
5 ID: A AP Study Questions Answer Section MULTIPLE CHOICE 1 ANS: B PTS: 1 DIF: 2 REF: Sec ANS: C PTS: 1 DIF: 2 REF: Sec ANS: A PTS: 1 DIF: 2 REF: Sec ANS: B PTS: 1 DIF: 2 REF: Sec ANS: D PTS: 1 DIF: 2 REF: Sec ANS: C PTS: 1 DIF: 2 REF: Sec ANS: B PTS: 1 DIF: 2 REF: Sec ANS: B PTS: 1 DIF: 2 REF: Sec ANS: B PTS: 1 DIF: 1 REF: Sec ANS: B PTS: 1 DIF: 2 REF: Sec ANS: A PTS: 1 DIF: 3 REF: Sec ANS: A PTS: 1 DIF: 3 REF: Sec ANS: A PTS: 1 DIF: 3 REF: Sec ANS: A PTS: 1 DIF: 3 REF: Sec ANS: C PTS: 1 DIF: 2 REF: Sec ANS: C PTS: 1 DIF: 3 REF: Sec ANS: B PTS: 1 DIF: 3 REF: Sec ANS: C PTS: 1 DIF: 1 REF: Sec ANS: C PTS: 1 DIF: 2 REF: Sec ANS: A PTS: 1 DIF: 3 REF: Sec ANS: B PTS: 1 DIF: 4 REF: Sec ANS: A PTS: 1 DIF: 4 REF: Sec ANS: D PTS: 1 DIF: 4 REF: Sec ANS: C PTS: 1 DIF: 4 REF: Sec ANS: E PTS: 1 DIF: 4 REF: Sec ANS: B PTS: 1 DIF: 3 REF: Sec ANS: D PTS: 1 DIF: 4 REF: Sec ANS: B PTS: 1 DIF: 5 REF: Sec ANS: D PTS: 1 DIF: 5 REF: Sec ANS: A PTS: 1 DIF: 2 REF: Sec ANS: A PTS: 1 DIF: 2 REF: Sec ANS: D PTS: 1 DIF: 2 REF: Sec ANS: D PTS: 1 DIF: 3 REF: Sec
6 ID: A 34 ANS: D PTS: 1 DIF: 4 REF: Sec ANS: E PTS: 1 DIF: 2 REF: Sec ANS: C PTS: 1 DIF: 4 REF: Sec ANS: E PTS: 1 DIF: 3 REF: Sec ANS: A PTS: 1 DIF: 3 REF: Sec ANS: E PTS: 1 DIF: 3 REF: Sec ANS: A PTS: 1 DIF: 3 REF: Sec ANS: A PTS: 1 DIF: 4 REF: Sec ANS: B PTS: 1 DIF: 4 REF: Sec ANS: B PTS: 1 DIF: 3 REF: Sec ANS: C PTS: 1 DIF: 3 REF: Sec ANS: D PTS: 1 DIF: 5 REF: Sec ANS: C PTS: 1 DIF: 2 REF: Sec ANS: A PTS: 1 DIF: 2 REF: Sec ANS: A PTS: 1 DIF: 2 REF: Sec ANS: A PTS: 1 DIF: 5 REF: Sec COMPLETION 50 ANS: PTS: 1 DIF: 5 REF: Sec ANS: 0.20 PTS: 1 DIF: 5 REF: Sec ANS: PTS: 1 DIF: 5 REF: Sec
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